N5 — outside your level filter
Is said whole, with nothing composed onto it and takes no だ／です, so there are no forms to conjugate.
頭がいい
atamagaiibe smartN5expression
Example sentences2
妹は昔から頭がいいです。
imouto wa mukashi kara atama ga ii desu.
My little sister has been smart since long ago. neutral
あいつ、ほんと頭がいいよな。
aitsu, honto atama ga ii yo na.
They're really smart, aren't they. casual