Antonyms of adv unnecessarily

1 of 2 senses of unnecessarily

Sense 1
unnecessarily -- (in an unnecessary manner; "they were unnecessarily rude")
       Antonym of necessarily (Sense 1)
      => necessarily, needfully -- (in an essential manner; "such expenses are necessarily incurred")

Synonyms of adv unnecessarily

2 senses of unnecessarily

Sense 1
unnecessarily -- (in an unnecessary manner; "they were unnecessarily rude")

Sense 2
unnecessarily -- (without any necessity; "this marathon would exhaust him unnecessarily")