also: なかよい
expression, i-adjective (yoi/ii class)
close; intimate; on good terms
Colloquial expression equivalent to 仲がいい, used to describe a close relationship between people.
See also: 仲がいい
あの二人は本当に仲いいね。
Those two are really close, aren't they?
We've been close since way back.
More standard and slightly more formal expression with the same meaning. 仲いい is a colloquial contraction.
Colloquial contraction of 仲がいい (naka ga ii), literally 'relationship is good'.