feeble

adjective
1
very weak
ناتوان, ضعیف, سست, کم‌جان
2
not effective; not showing energy or effort
ضعیف, ناتوان, بی‌اثر
a feeble argument/excuse/joke
She made a feeble attempt to explain what had happened.
Don't be so feeble! Tell her you don't want to go.
He told a few feeble jokes.