I wonder whether "On a whim & at whim" can be interchangeable like in these sentences:
1) I went to visit her on a whim.
2) He hires and fires people at whim.
3) We bought the house on a whim.
Understood that this word "whim" has to deal with emotional thing for sure. What is another word/expression we can use if not "whim"
Could you advise me please?
whim noun [C, U] a sudden wish to do or have sth, especially when it is sth unusual or unnecessary: He was forced to pander to her every whim. We bought the house on a whim. My duties seem to change daily at the whim of the boss. the whims of fashion She hires and fires people at whim.