gives a good account of oneself (verb) boast: brag
Sinonime: abrupt, ad-lib,
automatic,
careless, devil-may-care,
emotional,
extemporaneous,
flaky*, gone off deep end,
hasty, headlong, hot-and-cold,
impetuous,
instinctive,
intuitive, involuntary, jumping the gun,
mad, offhand,
passionate,
precipitate,
quick,
rash,
spontaneous,
sudden,
swift, unconsidered,
unexpected, unmeditated,
unpredictable, unpremeditated, unprompted, up-and-down,
violent, winging it
Antonime: cautious,
considering, heedful, premeditative,
thoughtful,
wise