"feeblest" in the adjective sense
1. feeble, lame
pathetically lacking in force or effectiveness
"a feeble excuse"
"a lame argument"
2. faint, feeble
lacking strength or vigor
"damning with faint praise"
"faint resistance"
"feeble efforts"
"a feeble voice"
3. decrepit, debile, feeble, infirm, rickety, sapless, weak, weakly
lacking bodily or muscular strength or vitality
"a feeble old woman"
"her body looked sapless"
4. feeble, nerveless
lacking strength
"a weak, nerveless fool, devoid of energy and promptitude"- Nathaniel Hawthorne
Source: WordNet® (An amazing lexical database of English)
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