Standard Lemma guide

illegitimately

adv · 3 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

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1

adv

Meaning 1

In an illegitimate manner.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: inauthentically, illegally, impermissibly, dishonestly, false, falsefully, falsely, illegitimately, insincerely, truthlessly, underhand, underhanded, underhandedly, unsincerely, untruly, untruthfully, criminally, forbiddenly, illicitly, unlawfully

Antonyms: legitimately

2

adverb

Meaning 2

of biological parents not married to each other

Definition source: Princeton WordNet 3.0

Examples

  • this child was born illegitimately

Meaning relationships

Synonyms: out of wedlock

Antonyms: legitimately

3

adverb

Meaning 3

in a manner disapproved or not allowed by custom

Definition source: Princeton WordNet 3.0

Examples

  • He acted illegitimately when he increased the rent fourfold

Meaning relationships

Synonyms: illicitly

Antonyms: legitimately

History

Etymology

Etymology tree English illegitimate Middle English -ly English -ly English illegitimately From illegitimate + -ly.