Synonyms for Unrestrained:

adj.

abandoned (adjective)
incontinent, unconstrained, ungoverned.
artless (adjective)
direct, candid, undeceitful, straightforward, trusting, naive, Unartful, undisguised, artless, outgoing, uncalculating, unsophisticated, frank, blunt, downright, unaffected, overt, honest, genuine, plain, Plain-spoken, Unbeguiling, natural, un-artificial, ingenuous, undeceiving, undeceptive, broad, callow, sincere, open.
demonstrative (adjective)
profuse.
excessive (adjective)
wild, candid, frank, uncurbed, free, dissolute, wanton, uninhibited, profligate, spontaneous, abandoned, unbridled, ungoverned, limitless, uncontrolled, unhampered, unchecked, intemperate, immoderate, loose, unlimited, blunt, flamboyant, open, incontinent, licentious, extravagant.
inordinate (adjective)
uncurbed, untempered.
loose (adjective)
unconfined.
uninhibited (adjective)
unrepressed, unhampered.
vulgar (adjective)
broad.
wasteful (adjective)
immoderate, lavish, overflowing, thriftless, opulent, overabundant, pound-foolish, profligate, overindulgent, profuse, gluttonous, wasteful, unconstrained, indulgent, extravagant, prodigal.

n.

unconditional, limitless, bottomless, endless, infinite, unregulated, boundless. free, loose, unconfined. dissolute, uncontrolled, fast, licentious, dissipated, incontinent, uninhibited, wanton, rakish, abandoned, restraint. laid-back, easygoing, casual, spontaneous, unceremonious, tighten, relaxed, informal, easy. unrestrained (noun)
excited, freewheeling, delirious, unhindered, excessive, untempered, exuberant, frantic, resplendent, unhampered, colorful, unbuttoned, mad, ungoverned, overweening, unbridled, extravagant, unchecked, intemperate, wild, unlaced, flamboyant, uncurbed.
unshackled (noun)
unrepressed, unlimited, free, untrammeled.

Other synonyms:

uninhibited, laid-back. rakish, licentious, abandoned, dissolute, easygoing, unceremonious, dissipated. uncontrolled, relaxed, casual, wanton. spontaneous. free. fast. easy. lustful
incontinent.
unchecked
unchecked.
unhampered
untrammeled, unhampered.
wanton
loose.
wild
wild.
without formality
informal.

Usage examples for unrestrained

  1. He was extravagant and unrestrained in his experiments on language. – Spenser (English Men of Letters Series) by R. W. Church
  2. It was now unrestrained gabble. – Ruggles of Red Gap by Harry Leon Wilson