Standard Lemma guide

doubtlessly

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

Without question; indubitably.

Definition source: English Wiktionary via Wiktextract

Usage: proscribed, sometimes

Examples

  • There are doubtlessly more insects than mammals.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

adv

Meaning 2

Without feeling doubt, without misgivings.

Definition source: English Wiktionary via Wiktextract

Usage: obsolete

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

adverb

Meaning 3

without doubt; certainly

Definition source: Princeton WordNet 3.0

Examples

  • it's undoubtedly very beautiful

Meaning relationships

Synonyms: undoubtedly, doubtless

Antonyms: none provided

History

Etymology

From Middle English doutelesly, dowtelesly, equivalent to doubtless + -ly.