Definitions:

1. Having concealed difficulty. ADJECTIVE
   • A catchy question.
2. Used to describe something that is easy to remember or attention-grabbing, often because it tis appealing, pleasant, or repetitive. ADJECTIVE
   • The song has a catchy melody that I can't get out of my head.

Synonyms:

• appealing
• attention-getting
• attractive
• noticeable
• tricky
• unforgettable