Indubiously

adv

adv ·5 syllables ·Rare ·Advanced level

Definitions

Adverb

1
Synonym of without a doubt.

Synonyms

without a doubt

Etymology

From indubious + -ly. Attested since the 17th century.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.