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I am looking for a single-word verb that means "acting impulsively". For example,
"You can never tell what Harley is going to do. She always [acts impulsively] without thinking things through."
I'd like it to be as generic as possible. "splurge" captures the idea I'm looking for, but the connotations of money don't work for me.
There are a lot of synonyms of impetuous viz - : impulsive, rash, hasty, overhasty, reckless, heedless, foolhardy, incautious, imprudent, injudicious, ill-conceived, ill-considered, unplanned, unreasoned, unthought-out, unthinking; spontaneous, impromptu, spur-of-the-moment, precipitate, precipitous, headlong, hurried, rushed.
None of them are verbs, but perhaps you can derive a verb from one of them - such as she always rushes in without thinking.
"You can never tell what Harley is going to do. She always jumps in without thinking things through."
2.5 (of a person) make a sudden, impulsive rush to do something:
‘Gordon jumped to my defence’
Reference:
https://en.oxforddictionaries.com/definition/jump
Like to add another with a lighter note, 'reacts', as oppose to 'responds'. The use of 'reacts' in the example sentence would have conveyed the intensity of impulsiveness. It is a toned-down version of the other words given in the answers above and, supposed, would be an alternative choice of words for asker and others.
But if anyone feels for other stronger words, these should serve vividfully well, 'barks', 'launches', 'explodes' or 'blasts'.
She always leaps without thinking things through.
This proposal comes from the idiom "look before you leap."
Think carefully about what you are about to do before you do it.
Though not a single-word verb, the following may work.
"You can never tell what Harley is going to do. She always has knee-jerk reactions."
ODO:
knee-jerk ADJECTIVE
1 [attributive] (of a response) automatic and unthinking.
‘a knee-jerk reaction’‘Everything he says about these issues is knee-jerk and over-bearing and made up of half-pieces of information he doesn't fully understand.’
‘There will be no knee-jerk reactions and I firmly believe we'll get ourselves out of this.’
She always charges ahead without thinking things through.
I haven't found a definition. But here's my picture of it: you are on a walk in the woods. Harley is the one out front.
