callow
Cross references:
1. rude
cal.low \'kal-(.)o-, -*(-w)\ \'kal-o--n*s, -*-n*s\ aj [ME calu bald, fr.
OE; akin to OHG kalo bald] of a bird 1: not yet having enough feathers to
fly 2: lacking adult sophistication : IMMATURE {~ youth} - cal.low.ness n
Webster's English Dictionary