ungainly
adjective /ʌnˈɡeɪnli/
  /ʌnˈɡeɪnli/
 - moving in a way that is not smooth or attractive synonym awkward
- He was a tall, ungainly boy of 18.
 - I felt very ungainly in the diving suit.
 
Oxford Collocations DictionaryUngainly is used with these nouns:- walk
 
Word Originmid 17th cent.: from un- ‘not’ + obsolete gainly ‘graceful’, based on Old Norse gegn ‘straight’.