1. In a vindictive, revengeful manner
   - revengefully, vindictively

See also: vengeful

• unobvious
• unoccupied
• unoffending
• unofficial
• unofficially
• unoiled
• unopen
• unopened
• unopposable
• unopposed
• unordered
• unorganised
• unorganized
• unoriented
• unoriginal
• unoriginality
• unoriginally
• unoriginated
• unornamented
• unorthodox
• unorthodoxy
• unostentatious
• unowned
• unoxygenated
• unpack