| cheery(adjective, pleasure, glad, merry, funny) |
| combustible(adjective, able, excitable, inflammable, flammable) |
| convertible(adjective, unstable, unsettled, changeable, variable) |
| cursory(adjective, brief, transient, transitory, short-lived) |
| flippant(adjective, smart, casual, unconcerned, changeable) |
| fragile(adjective, excitable) |
| frothy(sparkling, irresolution, gassy, foaming, fizzing) |
| gaseous(adjective, impulsive, unpredictable, changeable, explosive) |
| glad(adjective, pleasure, happy, merry, funny) |
| gleeful(adjective, pleasure, happy, glad, merry) |
| happy-go-lucky(adjective, pleasure, glad, merry, funny) |
| high-strung(adjective, anxious, unstable, restless, fiery) |
| hot-blooded(adjective, passionate, unpredictable, heated, fiery) |
| hysterical(adjective, anxious, nervous, worried, tense) |
| impatient(adjective, passionate, nervous, sensitive, unstable) |
| infirm(adjective, irresolute) |
| jocund(adjective, pleasure, happy, glad, merry) |
| jolly(adjective, pleasure, happy, glad, merry) |
| jovial(adjective, pleasure, glad, merry, funny) |
| joyful(adjective, pleasure, glad, merry, funny) |