impulsive (adj.)
- abrupt
- actuating
- adrift
- advanced
- afloat
- alternating
- amorphous
- animating
- automatic
- blind
- breakneck
- breathless
- brittle
- capricious
- causal
- causative
- changeable
- changeful
- changing
- choppy
- compelling
- compulsive
- conditioned
- corruptible
- deciduous
- desultory
- deviating
- devil-may-care
- different
- directive
- disorderly
- divergent
- diversified
- dizzy
- driving
- dying
- eccentric
- electrifying
- emotional
- ephemeral
- erose
- erratic
- evanescent
- extemporaneous
- fading
- fickle
- fitful
- fleeting
- flickering
- flighty
- fluctuating
- fly-by-night
- flying
- foolhardy
- forced
- forward
- fragile
- frail
- freakish
- fugacious
- fugitive
- giddy
- half-baked
- hasty
- headlong
- ill-considered
- immediate
- impatient
- impellent
- impelling
- impermanent
- impetuous
- inconsistent
- inconstant
- indecisive
- inducive
- infirm
- inherent
- innate
- instinctive
- insubstantial
- involuntary
- irregular
- irresolute
- irresponsible
- jagged
- jerky
- libidinal
- madcap
- mazy
- mechanical
- mercurial
- momentary
- moody
- mortal
- motivating
- motivational
- motive
- motley
- moving
- mutable
- natural
- nonconformist
- nonstandard
- nonuniform
- offhand
- overhasty
- passing
- perishable
- pluralistic
- precipitant
- precipitate
- precipitous
- precocious
- premature
- pressing
- previous
- pulsive
- quick
- ragged
- rambling
- rash
- reckless
- reflex
- reflexive
- restless
- rough
- roving
- rushed
- scatterbrained
- shapeless
- shifting
- shifty
- shocking
- short-lived
- spasmodic
- speedy
- spineless
- spontaneous
- sporadic
- spur-of-the-moment
- startling
- subliminal
- sudden
- surprising
- swift
- temporal
- temporary
- transient
- transitive
- transitory
- unaccountable
- unanticipated
- uncertain
- unconscious
- unconsidered
- uncontrolled
- uncrystallized
- undependable
- undisciplined
- unequal
- uneven
- unexpected
- unfixed
- unforeseen
- unintentional
- unlearned
- unlooked-for
- unorthodox
- unplanned
- unpredictable
- unpredicted
- unpremeditated
- unprepared
- unprompted
- unreliable
- unrestrained
- unripe
- unsettled
- unstable
- unsteady
- unsystematic
- unthinking
- untimely
- unwilled
- unwilling
- unwitting
- urgent
- vacillating
- vagrant
- variable
- variegated
- variform
- various
- varying
- volatile
- wandering
- wanton
- wavering
- wavy
- wayward
- whimsical
- wild
- wishy-washy
