IPA: /kɑːrˈtuːnɪʃli/
KK: /kɑrˈtunɪʃli/
In a way that is exaggerated or comical, similar to how characters are portrayed in cartoons.
The character moved cartoonishly, making everyone laugh at his silly antics.
Cartoonishly → It is formed from "cartoon" (from French *carton*, meaning a strong paper or cardboard) and the suffix "-ish" (meaning having the quality of). The word "cartoonishly" describes something that has the quality or characteristics of a cartoon, often implying exaggerated or whimsical features.
Think of the word 'cartoon' which refers to a style of drawing that is often exaggerated, and remember that 'cartoonishly' means something that has the qualities of a cartoon.