IPA: /ˈfeɪntli/
KK: /feɪntli/
In a way that is not strong or clear; slightly or softly.
She could faintly hear the music from the other room.
Faintly → It is formed from "faint" (from Old French *feint*, meaning feeble or weak) and "-ly" (meaning in a manner of). The word "faintly" means in a weak or feeble manner.
Think of something that is weak or barely noticeable — that's what 'faintly' means, as it describes something done in a feeble manner.