Synonyms: decrepit, fragile, frail, infirm, weak, etc.
Definition of Feeble
adjective
1. physically weak, as from age or sickness; frail.
2. weak intellectually or morally:
a feeble mind.
3. lacking in volume, loudness, brightness, distinctness, etc.:
a feeble voice; feeble light.
4. lacking in force, strength, or effectiveness:
feeble resistance; feeble arguments.
Examples:
She's still feeble from her long illness.We heard a feeble cry for help.Business is suffering because of the feeble economy.He made a feeble attempt to explain his behavior.