/ ˈfiːbl; NAmE / adjective ( fee·bler / ˈfiːblə(r); NAmE /, feeb·lest / ˈfiːblɪst; NAmE /)
1.
very weak :
a feeble old man
The heartbeat was feeble and irregular.
2.
not effective; not showing determination or energy :
a feeble argument / excuse / joke
a feeble attempt to explain
Don't be so feeble! Tell her you don't want to go.
► feeble·ness noun [ U ]
► feebly / ˈfiːbli; NAmE / adverb
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WORD ORIGIN
Middle English : from Old French fieble , earlier fleible , from Latin flebilis lamentable, from flere weep.