Adjective
seat-of-the-pants (not comparable)
(chiefly US, idiomatic) Done by feel, guess, or trial and error rather than by careful planning, thought or technique.
[Jury selection] is best based upon seat-of-the-pants instincts, which are undoubtedly crudely stereotypical and may in many cases be hopelessly mistaken. William Rehnquist
I am very much a seat-of-the-pants actor. I will prepare when I have to. But I like being unprepared. Lena Headey
Despite the windfall, a seat-of-the-pants approach still carries the day, with the label sometimes operating in the disorganized but intimate fashion of a small family business. Source: Internet
My seat-of-the-pants calculation suggest he’s about half way to Venus at closest approach(22.8 million Kms. of ~41 necessary). Source: Internet