虫むしがいい

also: むしがよい

虫がいい · i-adjective (yoi/ii class)

Form	Positive	Negative
Dictionary	虫むしがいい	虫むしがよくない
Polite	虫むしがいいです	虫むしがよくないですalso 虫むしがよくありません
Past polite	虫むしがよかったです	虫むしがよくなかったですalso 虫むしがよくありませんでした
Past	虫むしがよかった	虫むしがよくなかった
Te-form	虫むしがよくて	虫むしがよくなくて
Adverbial	虫むしがよく
Conditional	虫むしがよければ	虫むしがよくなければ
Tara conditional	虫むしがよかったら	虫むしがよくなかったら

Meanings

expression, i-adjective (yoi/ii class)

selfish; presumptuous; asking too much

Describes a person who is self-centered or makes unreasonable demands, often without considering others. The phrase literally means 'the bug is good,' referring to an inner selfish nature.

Kanji

虫insect, bug, temper
良good, pleasing, skilled

Related words

都つ合ごうがいいN5
虫がいい describes someone who is selfishly demanding, while 都合がいい more neutrally means 'convenient (for someone)', often used about situations rather than character.
身み勝がっ手て
身勝手 is a plain adjective meaning 'self-centered', whereas 虫がいい is an idiomatic phrase specifically about making unreasonable demands on others.
自じ分ぶん勝かっ手て
自分勝手 describes general selfish behavior in daily life, while 虫がいい more pointedly criticizes someone for expecting unfair favors.
図ずう々ずうしいN3
図々しい emphasizes shameless boldness in asking or acting, while 虫がいい focuses on the unfairness of the selfish request itself.

Written forms

虫むしがいい
Standard kanji spelling; the reading むしがいい is the most common.
虫が良い
- むしがよい
  Alternate spelling using 良い; the reading むしがよい is also used, though less common.
- むしがいい
虫むしがよい
Search-only form; not a standard written variant.
むしがよい

Etymology

虫 here reflects the traditional figurative sense of an inner impulse or disposition. 虫がいい describes that impulse as operating conveniently for oneself, hence “self-serving” or “presumptuous.”