Irrational
Reckless, Excessive
noun, な adjective
むちゃ
無茶 (むちゃ) Irrational, Reckless, Excessive
馬鹿らしい (ばからしい) Absurd
馬鹿馬鹿しい (ばかばかしい) Absurd, Ridiculous, Silly
無闇に (むやみに) Thoughtlessly, Unreasonably, Recklessly, Absurdly
It's Absurd that that moocher むちゃ thought I'd pay for him.