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

See also: unnecessary

Antonym: necessarily

• trisection
• triskaidekaphobia
• triskaidekaphobic
• triskele
• triskelion
• trismus
• trisodium orthophosphate
• trisodium phosphate
• trisomy
• trisomy 21
• trispectrum
• Tristan
• Tristan Tzara
• triste
• tristearin
• tristesse
• Tristram
• trisyllable
• tritanopia
• tritanopic
• trite
• tritely
• triteness
• tritheism
• tritheist