1. mentally ill or unstable
Usage: potentially offensive when referring to mental illness
2. extremely enthusiastic or excited about something
Usage: informal
3. very foolish or unreasonable
Usage: informal

1. extremely; very
Usage: informal

Examples

• The noise from the construction site is driving me crazy.
• She’s crazy about jazz music and goes to concerts every weekend.
• It would be crazy to drive in this snowstorm.
• The fans went crazy when their team scored the winning goal.
• That roller coaster was crazy fast!
• He has some crazy ideas about starting his own business.
• The party was crazy fun last night.