Irrational
Reckless, Excessive
noun, な adjective
Imagine having nothing but tea for an entire week. Sounds completely irrational, right? Such a reckless diet plan seems excessive.
無茶 is often used to point out that something goes against common sense; or to criticize or disapprove of some actions or situations that might be seen as reckless or excessive.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
こんなに車がビュンビュン通っていて横だん歩道もないのに、向こう側へわたるなんて、無茶だよ。
It's absurd to cross such a busy road without a pedestrian crossing.
ビエトは無茶なりょうのあわもりを飲んでいました。
Viet was drinking excessive amounts of awamori.
カレーソースでいっぱいのプールで泳ごうなんて、彼も無茶な決定をしたものだ。
He made the rash decision to try and swim in a pool filled with curry sauce.