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

See also: unnecessary

Antonym: necessarily

• look sharp
• look smart
• look to
• look up to
• look upon
• look-alike
• look-in
• look-over
• look-see
• lookdown
• lookdown fish
• looker
• looker-on
• looking
• looking at
• looking for
• looking glass
• looking glass tree
• looking-glass plant
• lookoff
• lookout
• lookout man
• lookout station
• lookup
• loom