in·tem·per·ate
/inˈtemp(ə)rət/
adjective: intemperate

Having or showing a lack of self-control; immoderate.
“intemperate outbursts concerning global conspiracies”

Opposite: Moderate

Given to or characterized by excessive indulgence, especially in alcohol. “An intemperate social occasion”

Similar:

immoderate, excessive, undue, inordinate, unreasonable, unjustified, unwarranted, uncalled for, extreme, unrestrained, unrestricted, uncontrolled, unbridled, uncurbed, self-indulgent, overindulgent, extravagant, lavish, prodigal, profligate, imprudent, reckless, wild, outrageous, egregious, dissolute, debauched, wanton, dissipated, dissipative.