IPA: /ˈsʌpli/
KK: /ˈsʌplɪ/
In a way that is flexible and able to bend easily without breaking.
The dancer moved supplely across the stage, showcasing her incredible flexibility.
Supplely is derived from "supple" (from Old French *souple*, meaning flexible or pliant) and the adverbial suffix "-ly" (meaning in a manner of). The word "supplely" means in a flexible or pliant manner.
Think of being flexible or pliant ('supple') and how the '-ly' suffix indicates the manner in which something is done. So, when you think of 'supplely', imagine doing something in a flexible way.
No commonly confused words.