say it: gruh-TOO-uh-tuhs
gratuitous is an adjective meaning "without cause". It carries 3 recorded senses.
unnecessary and unwarranted
“a strikers' tent camp...was burned with needless loss of life”
Definitions, synonyms and semantic relations for gratuitous 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.