| feeble | (adjective) lacking bodily or muscular strength or vitality | Synonyms: debile, decrepit, infirm, rickety, sapless, weak, weakly |
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| (adjective) lacking strength | Synonyms: nerveless |
| (adjective) lacking strength or vigor | Synonyms: faint |
| (adjective) pathetically lacking in force or effectiveness | Synonyms: lame |
| feebleminded | (adjective) retarded in intellectual development | Synonyms: backward, half-witted, slow-witted |
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| feeblemindedness | (noun) severe mental deficiency | - |
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| feebleness | (noun) the quality of lacking intensity or substance | Synonyms: tenuity |
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| (noun) the state of being weak in health or body (especially from old age) | Synonyms: debility, frailness, frailty, infirmity, valetudinarianism |
| feebly | (adverb) in a halting and feeble manner | - |
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| (adverb) in a faint and feeble manner | - |