coltish       
adjective uk/ˈkəʊl.tɪʃ/ us/ˈkoʊl.tɪʃ/
 (年轻人)精力充沛但动作笨拙的
A coltish person is young and energetic but awkward.
  Gigi is a coltish young girl growing up in turn-of-the-century Paris. 吉吉是世纪之交在巴黎长大的精力充沛但动作笨拙的小姑娘。 
 coltish limbs 充满活力但动作笨拙的四肢 
 See: colt
 - More examples
 - She was coltish; now she's womanly.
 - I've always liked your coltish enthusiasm.
 - She was charming and coltish, a bit like a schoolgirl at her first grown-up party.