遅くて

late and, because ... is late

→ 遅い
遅 late + く Adverbial form + て Te-form (conjunctive form)
adjective Rare #44,098
late and, because ... is late The connective form of 遅い. With も (遅くても), it means “even if ... is late.”
JA: 電車が遅くて、困りました。
EN: The train was late, so I had trouble.
Forms of 遅い

「太郎帰ってきた?」「まだなの。最近、帰りが遅くてね」

“Is Taro home yet?” “Not yet. He’s been getting home late lately.”

遅くても来ないよりまし。

Better late than never.

親の帰りが遅くてねえいつもああして待ってるんだよ

My parents get home late, so I always wait like that.

— The Wind Rises (2013)

遅くてもしないよりはまし。

Better late than never.