CALLOW
- immature
- an alluvial flat [n -S] / immature [adj CALLOWER, CALLOWEST]
- immature (not fully grown or developed) [adj CALLOWER, CALLOWEST] : CALLOWLY [adv]
- is a synonym of immature used to describe someone, especially a young person, who does not have much experience and does not know how to behave like an adult.