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Definition of certainness

certainness

/ˈsɜːrtənnəs/
cer · tain · ness
Adverb:certainly
•
Plural:certainnesses
•
Adjective:certain
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certainness Lexical Profile

• noun

1

The quality or state of being completely free from doubt; full conviction or assurance.

Example

"She spoke with a quiet certainness that immediately reassured the anxious committee."

Synonyms
View all synonyms for certainness
Antonyms
View all antonyms for certainness

Word Nuance & Usage

While "certainness" is grammatically valid, "certainty" is far more common in standard English.

• Rhymes for certainness

• Nearby Words

ceriman
certain
certainly
certainness
certainty
certifiable
certifiably

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Certainness. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/certainness
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