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.
無茶なこと言わないでよ。
Don't say irrational things.
そのアイデアは無茶だと思います。
I think that idea is unreasonable.
あんまり無茶ばっかりしないでね。みんな心配してるよ。
Don't be too reckless. Everyone is worried about you.