1. Somewhat young

See also: immature, young

• open frame
• open house
• open interval
• open letter
• open marriage
• open order
• open primary
• open sandwich
• open season
• open secret
• open sesame
• open shop
• open sight
• open society
• Open University
• open up
• open weave
• open-air
• open-air market
• open-air marketplace
• open-and-shut
• open-angle glaucoma
• open-class word
• open-collared
• open-door policy