Explanation:

A. USEFUL: Useful means serving a practical purpose or being effective. This is an antonym, not a synonym, of 'ungainly'.\nB. HANDY: Handy means convenient to handle or use; useful. This is also an antonym of 'ungainly'.\nC. AWKWARD: Awkward means difficult to use, do, or deal with, or lacking grace or skill in movement or behavior. This is a direct synonym for 'ungainly', which means clumsy or ungraceful.\nD. FORBID: Forbid means to refuse to allow something or to prohibit. This word is unrelated in meaning to 'ungainly'.