IPA: /ˈkrʊkɪdli/
KK: /ˈkrʊkɪdli/
In a way that is not straight or is bent; in a dishonest or unfair manner.
The picture hung crookedly on the wall, making the room look unbalanced.
Crookedly is formed from "crooked" (from Old English "crōc", meaning bent or twisted) and "-ly" (meaning in a manner of). The word describes an action done in a bent or twisted manner.
Think of something that is 'bent' or 'twisted' ('crooked') and remember that 'crookedly' means doing something in a bent or twisted way.