1. In an unnecessary manner
   "they were unnecessarily rude" 
2. Without any necessity
   "this marathon would exhaust him unnecessarily"

See also: unnecessary

Antonym: necessarily

• bombed
• bomber
• bomber aircrew
• bomber crew
• Bomber Harris
• bomber jacket
• bombie
• bombilate
• bombilation
• Bombina
• coach horse
• coach house
• coach station
• coach-and-four
• coachbuilder
• coaching
• coaching job
• coachload
• coachman
• coachwhip
• coachwhip snake
• coachwork
• coact
• coaction
• coactive