Absurd
Rash, Excessive
noun, な adjective
The tea supply is down to nothing??? That's absurd! For Americans, I imagine this word would be "無コーヒー" instead. Get it?? If you're a caffeine addict this word will make total sense.
むちゃ
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.