say it: uhn-NES-uh-ser-uh-lee
unnecessarily is an adverb meaning "in an unnecessary manner". It carries 2 recorded senses.
without any necessity
“this marathon would exhaust him unnecessarily”
Definitions, synonyms and semantic relations for unnecessarily come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.