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

See also: unnecessary

Antonym: necessarily

• man and wife
• man Friday
• man hour
• man in the street
• man jack
• man of action
• man of affairs
• man of deeds
• man of God
• man of letters
• man of means
• man of the cloth
• man of the world
• man's body
• man's clothing
• man-about-town
• man-at-arms
• man-child
• man-eater
• man-eating
• man-eating shark
• man-made
• man-made fiber
• man-made fibre
• man-made lake