on a whim
(idiomatic) Without thinking seriously about the consequences.
She was afraid of all that and so much more, but what terrified her most was inside of her, an insect of unnatural intelligence who'd been living in her brain her entire life, playing with it, clicking across it, wrenching loose its cables on a whim. Dennis Lehane
You can knock down kingdoms on a whim. What you need is someone to make sure you don't get hit by a carriage when you cross the street. Scott Lynch
The investor and the employee are in the same position, but sometimes the employee is more important, because he will be there a long time whereas an investor will often get in and out on a whim in order to make a profit. Akio Morita
I love designer stuff but like it will only be like, on a whim. I love Alexander Wang so much, but it's expensive. Ellie Goulding
I had been doing plays in New York and on a whim we packed up and moved West, I started doing commercials and plays and guest star spots on TV and one thing led to another and I got Knots Landing. Joan Van Ark
I started acting, almost on a whim to help my music career. Lance Reddick