Synonyms: gratuitous
Definition: without cause
Usage: a gratuitous insult
Similar words: unmerited
Definition: not merited or deserved
Usage: received an unmerited honorary degree
Synonyms: gratuitous, uncalled-for, needless
Definition: unnecessary and unwarranted
Usage: a strikers' tent camp...was burned with needless loss of life
Similar words: unnecessary, unneeded
Definition: not necessary
Synonyms: complimentary, costless, free, gratis, gratuitous
Definition: costing nothing
Usage: complimentary tickets; free admission