IPA: /ˈfiːbli/
KK: /ˈfiːbli/
In a weak or ineffective way; lacking strength or force.
She raised her hand feebly, hoping to get the teacher's attention.
Feebly → It is formed from "feeble" (from Old French *feeble*, meaning weak or frail) and the suffix "-ly" (meaning in a manner of). The word "feebly" means in a weak or frail manner.
Think of the word 'feeble' which means weak, and remember that 'feebly' describes doing something in a weak way.