Webster's English Dictionary

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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