infirm.
Weak or ill, not in good health.
Meaning & usage
Weak or ill, not in good health.
He was infirm of body but still keen of mind, and though it looked like he couldn't walk across the room, he crushed me in debate.
Irresolute; weak of mind or will.
Frail; unstable; insecure.
Where this word comes from
* The noun is from Middle English infirme, from Latin infirmus (“weak, feeble”). * The verb is from Latin īnfirmāre, from īnfirmus (“sick, weak, infirm”) + -ō.
To contradict, to provide proof that something is not.
The thought is that you see an episode of observation, experiment, or reasoning as confirming or infirming a hypothesis depending on whether the probability of it being correct increases or decreases during the episode.
Where this word comes from
* The noun is from Middle English infirme, from Latin infirmus (“weak, feeble”). * The verb is from Latin īnfirmāre, from īnfirmus (“sick, weak, infirm”) + -ō.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.