Find Antonyms

supposition Antonyms

Opposite of supposition

Pinning down the opposite of supposition requires matching its exact sense, so the antonyms and opposite words below are paired with a clear noun definition and ranked by contrast strength.
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• noun (Context 1)

An uncertain belief, assumption, or hypothesis held without conclusive proof.

Usage Example

"The detective's initial theory was based on mere fact rather than hard evidence."

Strongest
fact
certainty
proof
Strong
reality
truth
knowledge

Similar words to supposition

Words similar to supposition shift depending on context. Common synonyms include:

assumption
conjecture
presumption
hypothesis
speculation
surmise
theory
guess
See all synonyms of supposition

• Nearby Words

supposed
supposedly
supposing
supposition
suppress
suppressant
suppression

Cite this Entry

Wordmom. (2026). Antonyms for Supposition. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/supposition
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