volcanic

demonstrative fidgety fiery high-strung hysterical impulsive restless skittish temperamental

agitable alarmable edgy emotional enthusiastic fierce galvanic hasty hot-headed hot-tempered impatient impetuous inflammable intolerant irascible mercurial moody nervous neurotic overzealous passionate peevish quick quick-tempered rash reckless sensitive short-fused susceptible testy touchy uncontrolled uneasy vehement violent volatile

calm cold cool laid-back

easy easygoing insensitive passive unexcitable uninspired