Meanings
Usage patterns
いい加減な〈人〉an irresponsible/careless person
He's a pretty irresponsible person, so it's better not to trust him too much.
いい加減な〈事〉something vague, half-baked, or made up
The teacher confused the students by saying something vague and half-baked.
もういい加減〈形容詞〉to have reached a considerable/fed-up degree of a feeling
I'm pretty exhausted by now, so let's stop for today.
Expressions
いい加減にしろthat's enough!; cut it out!; get a life! いい加減にするput an end to; quit doing excessively; get over with