いい
iiadjective★Beginner
informal
Good, fine, or pleasant
この映画はとてもいいです。
This movie is very good.
天気がいいですね。
The weather is nice, isn't it?
💡
Often used as an informal adjective to describe something positive or satisfactory.
informal
Okay, acceptable, or all right
いいですよ。
That's okay.
いいんじゃない？
Isn't that okay?
💡
Can be used to express agreement or permission in casual contexts.
Collocations
いい感じgood feelingいい加減enough, moderateいいねgood, nice
Synonyms
Antonyms
Related Phrases
いいんじゃない？phrase
Isn't that okay?
いい加減にしてphrase
That's enough!
💡Pro Tip
Casual vs. Formal Usage
Use 'いい' in informal settings like conversations with friends. For formal writing or speaking, use '良い' (よい).
⚡Gold Rule
Flexible Meaning
The meaning of 'いい' can vary based on context, from 'good' to 'okay' or 'acceptable'.
📖Word Origin
Derived from the classical Japanese adjective 'よい' (good), with 'いい' being a more casual and modern form.
📝Usage Notes
While 'いい' is informal, it is widely used in everyday conversation. In formal contexts, '良い' (よい) is preferred.
Word Breakdown
いい
good, fine, or pleasant
root✎ Noted on May 2, 2026JA → EN