gratuitous

adj. given without charge, free; unwarranted, having no apparent cause

Adjective
1. without cause; "a gratuitous insult"
(similar) unmerited
2. costing nothing; "complimentary tickets"
(synonym) complimentary, costless, free, gratis(p)
(similar) unpaid
3. unnecessary and unwarranted; "a strikers' tent camp...was burned with needless loss of life"
(synonym) needless, uncalled-for
(similar) unnecessary, unneeded

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

(a.)
Given without an equivalent or recompense; conferred without valuable consideration; granted without pay, or without claim or merit; not required by justice.
  

Synonyms and related words:
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
  

gratuitous /grə'tju:itəs/
tính từ cho không, không lấy tiền; không mất tiền, không phải trả tiềna gratuitous help: sự giúp đỡ không lấy tiền không có lý do, vô cớ, vu vơa gratuitous lie: sự nói dối không có lý doa gratuitous insult: lời lăng mạ vô cớ
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