Synonyms of gratuitous

1 Syllable
comp, freest, freer
2 Syllables
willing, groundless, comper, costless, gratis, unpaid, mindless
3 Syllables
unasked, causeless, spontaneous, unneeded, superfluent, superfluous, nitwitted, free-willed, freewilled, baseless, chargeless, merciless, unfounded, uncurbed, unforced
4 Syllables
unjustified, uncompelled, residuary, unrequired, inessential, unwarranted, unprovoked, unrewarded, unsalaried, unprescribed, unasked-for, voluntary, undemanded, iron-fisted, foundationless, unrequested, untempered, ironfisted
5 Syllables
overindulgent, unsolicited, uncompensated, unnecessary, unmeasurable, complimentary, unrecompensed, inordinate
6 Syllables
unremunerated, eleemosynary, uncorroborated
7 Syllables
supererogatory