Standard Lemma guide

pernicious

adj · 6 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • Received-Pronunciation: /pəˈnɪʃəs/
  • General-American: /pɚˈnɪʃəs/
  • US: Recorded audio is listed in the source snapshot.
  • rhymes with -ɪʃəs
  • CMU ARPABET: P ER0 N IH1 SH AH0 S Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Causing much harm in a subtle way.

Definition source: English Wiktionary via Wiktextract

Examples

  • pernicious influence
  • pernicious effects
  • They warned of the pernicious effects of misinformation.
  • The weed has a pernicious influence on local crops.

Meaning relationships

Synonyms: deleterious, venom

Antonyms: none provided

2

adj

Meaning 2

Causing death or injury; deadly.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: attery

Antonyms: none provided

3

adj

Meaning 3

Insidiously villainous: intending to cause harm, especially in a subtle way.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

adj

Meaning 4

swift; celeritous.

Definition source: English Wiktionary via Wiktextract

Usage: obsolete

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

adjective satellite

Meaning 5

working or spreading in a hidden and usually injurious way

Definition source: Princeton WordNet 3.0

Examples

  • glaucoma is an insidious disease
  • a subtle poison

Meaning relationships

Synonyms: insidious, subtle

Antonyms: none provided

6

adjective satellite

Meaning 6

exceedingly harmful

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: baneful, deadly, pestilent

Antonyms: none provided

History

Etymology

From Middle English, from Old French pernicios, from Latin perniciōsus (“destructive”), from perniciēs (“destruction”), from per (“through”) + nex (“slaughter, death”).

Analyzable as pernīx ("swift") + -ious.

Across languages

Translations

78 source translations are retained for this English entry.

  • Bulgarian: па́губен (páguben) — causing much harm
  • Chinese Mandarin: 有害 (yǒuhài) — causing much harm
  • Dutch: schadelijk — causing much harm
  • Dutch: destructief — causing much harm
  • Dutch: verderfelijk — causing much harm
  • Finnish: turmiollinen — causing much harm
  • Finnish: haitallinen — causing much harm
  • Finnish: tuhoisa — causing much harm
  • French: nocif — causing much harm
  • French: malsain — causing much harm
  • French: pernicieux — causing much harm
  • Georgian: მავნე (mavne) — causing much harm
  • Georgian: მავნებელი (mavnebeli) — causing much harm
  • Georgian: საზიანო (saziano) — causing much harm
  • Georgian: მაწყინარი (mac̣q̇inari) — causing much harm
  • German: schädlich — causing much harm
  • German: bösartig — causing much harm
  • German: verderblich — causing much harm
  • German: perniziös — causing much harm
  • Greek: ολέθριος (oléthrios) — causing much harm
  • Hindi: नाशक (nāśak) — causing much harm
  • Hungarian: ártalmas — causing much harm
  • Italian: pernicioso — causing much harm
  • Japanese: 有害な (yūkai na) — causing much harm
  • Latin: perniciosus — causing much harm
  • Macedonian: погубен (poguben) — causing much harm
  • Norwegian Bokmål: fordervelig — causing much harm
  • Polish: groźny — causing much harm
  • Polish: szkodliwy — causing much harm
  • Polish: zgubny — causing much harm
  • Portuguese: pernicioso — causing much harm
  • Romanian: pernicios — causing much harm
  • Romanian: vătămător — causing much harm
  • Romanian: dăunător — causing much harm
  • Russian: тлетво́рный (tletvórnyj) — causing much harm
  • Russian: па́губный (págubnyj) — causing much harm
  • Russian: зловредный (zlovrednyj) — causing much harm
  • Scottish Gaelic: sgriosail — causing much harm
  • Serbo-Croatian: štetan — causing much harm
  • Spanish: pernicioso — causing much harm
  • Swedish: fördärvlig — causing much harm
  • Turkish: habis — causing much harm
  • Turkish: muzır — causing much harm
  • Turkish: pernisiyöz — causing much harm
  • Turkish: zararlı — causing much harm
  • Ukrainian: згубний (zhubnyj) — causing much harm
  • Ukrainian: шкідливий (škidlyvyj) — causing much harm
  • Bulgarian: ги́белен (gíbelen) — causing death or injury
  • Bulgarian: па́губен (páguben) — causing death or injury
  • Chinese Mandarin: 致命 (zhìmìng) — causing death or injury
  • Dutch: dodelijk — causing death or injury
  • Dutch: schadelijk — causing death or injury
  • Finnish: tappava — causing death or injury
  • French: nocif — causing death or injury
  • French: délétère — causing death or injury
  • French: nuisible — causing death or injury
  • French: dangereux — causing death or injury
  • German: perniziös — causing death or injury
  • German: tödlich — causing death or injury
  • Greek: ολέθριος (oléthrios) — causing death or injury
  • Greek: θανατηφόρος (thanatifóros) — causing death or injury
  • Hindi: नाशक (nāśak) — causing death or injury
  • Hungarian: veszedelmes — causing death or injury
  • Japanese: 致命的な (chimeiteki na) — causing death or injury
  • Macedonian: погубен (poguben) — causing death or injury
  • Māori: whakawhara — causing death or injury
  • Māori: whakamōrearea — causing death or injury
  • Polish: zgubny — causing death or injury
  • Portuguese: mórbido — causing death or injury
  • Romanian: pernicios — causing death or injury
  • Romanian: vătămător — causing death or injury
  • Romanian: dăunător — causing death or injury
  • Russian: вре́дный (vrédnyj) — causing death or injury
  • Russian: ги́бельный (gíbelʹnyj) — causing death or injury
  • Serbo-Croatian: poguban — causing death or injury
  • Spanish: pernicioso — causing death or injury
  • Turkish: ölümcül — causing death or injury
  • Turkish: pernisiyöz — causing death or injury