1. Lacking seriousness; given to frivolity
   - dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly

See also: frivolous

• Hibiscus elatus
• Hibiscus esculentus
• Hibiscus farragei
• Hibiscus heterophyllus
• Hibiscus moschatus
• Hibiscus moscheutos
• Hibiscus mutabilis
• Hibiscus rosa-sinensis
• Hibiscus sabdariffa
• Hibiscus syriacus
• Hibiscus tiliaceus
• Hibiscus trionum
• hic
• hiccough
• hiccough nut
• hiccup
• hiccup nut
• hick
• hickey
• Hickock
• hickory
• hickory nut
• hickory pine
• hickory tree
• hidalgo