Infirm Definition

ĭn-fûrm
adjective
infirmer, infirmest
Not firm or strong physically; weak; feeble, as from old age.
Webster's New World
Not stable, firm, or sound; frail; shaky, as a structure.
Webster's New World
Not firm in mind or purpose; not resolute; vacillating.
Webster's New World
Not secure or valid.
An infirm title to property.
Webster's New World
Wiktionary
verb

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 your probability for it increases or decreases during the episode.
Wiktionary

Other Word Forms of Infirm

Adjective

Base Form:
infirm
Comparative:
infirmer
Superlative:
infirmest

Origin of Infirm

  • Middle English infirme from Old French from Latin īnfirmus in- not in–1 firmus strong, firm dher- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • Borrowing from Latin infirmus.

    From Wiktionary

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