adj.

1. Weak in body, especially from old age or disease; feeble. See synonyms at weak.
2. Lacking firmness of will, character, or purpose; irresolute.
3. Not strong or stable; shaky: an infirm support.

[Middle English infirme, from Old French, from Latin īnfirmus : in-, not; see in–¹ + firmus, strong, firm.]

infirmly in·firm'ly adv.

adjective

1. Not physically strong: decrepit, delicate, feeble, flimsy, fragile, frail, insubstantial, puny, unsound, unsubstantial, weak, weakly. See strong/weak.
2. Lacking stability: insecure, precarious, shaky, tottering, tottery, unstable, unsteady, unsure, weak, wobbly. See change/persist, strong/weak.

adj

Definition: sick, weak
Antonyms: firm, healthy, hearty, robust, sound, strong, well

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Sickly; a weak person. In particular circumstances the testimony of an "infirm" person may be obtained in a manner that differs from regular procedure to prevent its loss through the death of the witness. See de bene esse.

Weak; feeble, as from disease or old age.

IN BRIEF: Lacking bodily or mental strength. Also: irresolute, vacillating.

The delicate and infirm go for sympathy, not to the well and buoyant, but to those who have suffered like themselves. — Catherine E. Beecher (1800-1878), U.S. educator, writer.

Dansk (Danish)
adj. - usikker, svag, svagelig

Nederlands (Dutch)
gebrekkig, zwak, slap

Français (French)
adj. - infirme, invalide, irrésolu (arch)

Deutsch (German)
adj. - gebrechlich, schwach

Ελληνική (Greek)
adj. - ασθενικός, αρρωστιάρης/-ικος, ανάπηρος, σακάτης, ασταθής, αδύνατος

Italiano (Italian)
infermo

Português (Portuguese)
adj. - enfermo

Русский (Russian)
слабый, нерешительный, неустойчивый, ослаблять

Español (Spanish)
adj. - enfermizo, débil, nulo

Svenska (Swedish)
adj. - klen, kraftlös, ålderdomssvag, ostadig, obeslutsam

中文（简体） (Chinese (Simplified))
弱的, 柔弱的, 虚弱的

中文（繁體） (Chinese (Traditional))
adj. - 弱的, 柔弱的, 虛弱的

한국어 (Korean)
adj. - 약한, 우유부단한, 견고하지 못한

日本語 (Japanese)
adj. - 弱い, 衰弱した, 意志薄弱な, 優柔不断な, 薄弱な

العربيه (Arabic)
‏(صفه) عاجز, غير مستقر‏

עברית (Hebrew)
adj. - ‮לוקה בשכלו, חלש, לא החלטי‬

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