adverb
Adverbial form of 良い, used to describe doing something in a good, proper, or skilled manner. Often appears as よく, but よう is a colloquial or dialectal variant.
See also: 良く
この機械はよう動く。
This machine works well.
彼はようやった。
He did it skillfully.
adverb
Used to indicate that something happens often. More commonly expressed as よく, but よう appears in some dialects or casual speech.
See also: 良く
あの店にはよう行く。
I often go to that shop.
adverb
how (could you); why (would you)
Expresses incredulity, sarcasm, or disapproval. Often used in rhetorical questions. Equivalent to よく in similar expressions.
ようそんなことが言えるな。
How can you say such a thing?
ようそんな嘘がつけるね。
How can you tell such a lie?
Standard adverbial form of 良い; よう is a colloquial or dialectal variant with the same meanings but less formal.
Colloquial or dialectal variant of the adverbial form よく, from 良い (good). The exact regional or historical derivation is uncertain.