1) Abandoned 2) Excessive 3) Extravagant 4) Exuberant 5) Free 6) Freewheeling 7) Highflying 8) Hysterical 9) Not constrained 10) Not restrained or controlled 11) Not subject to restraint 12) Overweening 13) Rampant 14) Unbridled 15) Unbuttoned 16) Unchecked 17) Unconcealed 18) Uncontrolled 19) Uncurbed 1) All out 2) Ariot 3) Audacious 4) Corybantic 5) Dionysian 6) Extravagant 7) Free 8) Freewheeling 9) Intemperate 10) Lawless 11) Limitless 12) Loose 13) On a spree 14) Outgoing 15) Out of control 16) Overweening 17) Rampant 18) Unbounded 19) Unbridled 20) Unchecked 21) Uncontrolled 22) Uncurbed 23) Ungoverned 
[adj] - not subject to restraint
adjective not subject to restraint; `unrestrained laughter`
not restrained or controlled; uncontrolled or uncontrollable: the unrestrained birthrate in some countries. · not constrained; spontaneous: unrestrained laughter.
[SAT terms] marked by uncontrolled excitement or emotion