買わなくて

not buy

→ 買う
買わ buy + なく Negative + て Te-form (conjunctive form)
verb · informal Rare #27,800
not buy This negative te-form connects to another clause. In 買わなくてはならない, it forms “must buy.”
JA: 今日は何も買わなくて、すぐ帰った。
EN: I didn’t buy anything today and went straight home.
Conjugation of 買う

外国から買わなくてはなりません。

We have to buy it from abroad.

こんなものを買わなくてよかった。

I'm glad I didn't buy something like this.

そんな高い本買わなくてもよかったのに。

You didn't have to buy such an expensive book.

水をマレーシアから買わなくてはならないのです。

We have to buy water from Malaysia.

バスに乗るには切符を買わなくてはならない。

You have to buy a ticket to ride the bus.

その本は買わなくてもよかったのに。

You didn't have to buy that book.