1. (adjective) cheerfully irresponsible

• carefree
• freewheeling
• happy-go-lucky
• harum-scarum
• slaphappy

2. (adjective) marked by a carefree unconventionality or disreputableness

• raffish
• rakish

1. (adjective) cheerfully irresponsible

• irresponsible

2. (adjective) marked by a carefree unconventionality or disreputableness

• unconventional

1. (adjective) cheerfully irresponsible

• carefreeness
• insouciance
• lightheartedness
• lightsomeness
• daredevil
• harum-scarum
• hothead
• lunatic
• madcap
• swashbuckler

2. (adjective) marked by a carefree unconventionality or disreputableness

• rakishness