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: よく
This machine works well.
He did it skillfully.
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: よく
I often go to that shop.
how (could you); why (would you)
Expresses incredulity, sarcasm, or disapproval. Often used in rhetorical questions. Equivalent to よく in similar expressions.
How can you say such a thing?
How can you tell such a lie?
Casual elongated spelling, often in informal writing.
Kanji spelling using 良; rare and literary.
Kanji spelling using 善; very rare.
Kanji spelling using 能; very rare.
Colloquial or dialectal variant of the adverbial form よく, from 良い (good). The exact regional or historical derivation is uncertain.