IPA: /kəmˈpɛlɪŋli/
KK: /kəmˈpɛlɪŋli/
In a way that is very interesting or attractive, making people want to pay attention or believe something.
The speaker presented her ideas compellingly, capturing the audience's full attention.
Compellingly is formed from "compel" (from Latin "compellere", meaning to drive together or force) and the suffix "-ingly" (meaning in a manner of). The word describes an action done in a way that forces attention or interest.
Think of being 'driven together' ('compel') to pay attention — that's why compellingly means doing something in a way that captures interest.