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on a whim

on a whim

24 5.8
To do something suddenly without planning
  • idiom
translation icon : por impulso
  • She bought the jacket on a whim while shopping, even though she hadn't planned to.

But yeah, buying things on a whim is not something that I do.

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Examples

  • And so I downloaded TikTok on a whim and thought maybe I would start talking about these things.

  • I sort of signed up on a whim.

  • But yeah, buying things on a whim is not something that I do.

  • And I try to kind of say yes to things on a whim a little bit more.

  • I picked those on a whim!

  • I wrote to you on a whim, you know, in April.

    Fiction book (1991)
  • Once, on a whim, he drove her up to the Valley for the day.

    Fiction book (1994)
  • Last week, on a whim, I stopped by while Julio was still at work.

    Fiction book (1999)
  • Sometimes you download an app on a whim and then find yourself deleting that app immediately.

    Blog text (6)
  • I booked this flight on a whim with a friend and I don't know anything about it.

Synonyms

spontaneously
vson a whim
48 4.4

To act naturally without planning or being forced

is more sudden and impulsive, driven by a quick urge rather than naturalness
spur of the moment
vson a whim
  • Informal
12 5.5

A sudden decision made without thinking

is about sudden impulse generally rather than just a quick decision
impulsively
vson a whim
12 5.1

Act quickly because you suddenly want to, without thinking first

is sudden and unplanned but not only caused by an inner urge
offhand
vson a whim
7 6.3

Said or done immediately without careful thought

is more emotionally driven and sudden rather than merely unprepared
6 4.4

To act suddenly without planning or thinking

shares the same sudden and impulsive sense rather than a different meaning
to up and decide
vson a whim
  • Informal
1 7.8

To suddenly choose to do something without planning

is sudden and impulsive in motive rather than only fast decision timing

Antonyms

320 3.7

To do something on purpose and with care

1 6.8

In a planned, careful way to get a particular result

How Impulsive

recklessly
30 4.6
spontaneously
48 4.4
on a whim
24 5.8
impulse
185 3.6
planned
26 1.0

Surface Forms

on a whim positive

Morphology

on + a + whim

The meaning is directly derivable from 'whim' (a spontaneous, often irrational desire) combined with the prepositional pattern 'on + noun' indicating action motivated by that state. This compositional construction is common in English and in many other languages, so a B1 learner who knows the constituent words would readily infer 'on a whim' = impulsively/without planning.

Etymology

On a whim may come from an old short word whim, meaning a small, sudden idea or fancy. Because it names that quick thought that makes you act, on a whim means doing something 'suddenly' or 'without planning'.