1. (a.) Given without an equivalent or recompense; not called for; as, gratuitous violence in a movie\; conferred without valuable consideration; granted without pay, or without claim or merit; not required by justice.

2. (a.) Not called for by the circumstances; without reason, cause, or proof; adopted or asserted without any good ground; as, a gratuitous assumption.

God-given accorded aimless allowed amorphous arbitrary autonomous baseless bestowed biggety bluff bottomless brash capricious casual charitable cheeky chutzpadik cocky complimentary contemptuous costless crusty de trop derisive desultory disarticulated discontinuous discretional discretionary disjunct disordered dispensable dispersed disproportionate disrespectful elective eleemosynary erratic excess expendable expenseless expletive facy fitful flip flippant for free for love for nothing formless free free as air free for nothing free gratis free of charge free of cost free will freebie fresh frivolous gally giftlike given granted gratis groundless haphazard hit-or-miss immethodical impertinent impudent in excess inchoate incoherent indefensible independent indiscriminate irrational irregular malapert meaningless misshapen needless nervy nonessential nonmandatory nonsymmetrical nonsystematic nonuniform offered on the house optional orderless pert planless pleonastic proffered prolix promiscuous providential random reasonless redundant rude sassy saucy self-acting self-active self-determined self-determining senseless shapeless smart smart-alecky smart-ass spare spasmodic spontaneous sporadic straggling straggly supererogatory superfluous systemless tautologic tautologous to spare unarranged unasked unbesought unbidden unbought uncalled-for unclassified uncoerced uncompelled undirected unessential unforced unfounded ungraded ungrounded uninfluenced uninvited unjoined unjustifiable unjustified unlooked-for unmethodical unnecessary unneeded unordered unorganized unpaid-for unpressured unprompted unrequested unrequired unsolicited unsorted unsought unsupportable unsymmetrical unsystematic untaxed ununiform unwarranted unwelcome vague verbose voluntary volunteer vouchsafed wandering wanton willful willing wise-ass without charge