できなくて

unable to, not able to

→ 出来る
でき can; be able to + なくて Negative te-form
verb Uncommon #17,048
unable to, not able to Negative te-form of できる; often links inability to a result, reason, or apology.
JA: 今日は仕事ができなくて困った。
EN: I couldn't work today, and it caused a problem.
Conjugation of 出来る

お手伝いできなくてごめんなさい。

I'm sorry I can't help you.

できなくて歯医者みたいなニオイで

I couldn't do it, and it smelled like a dentist's office.

— JUNO/ジュノ (2007)

結婚式に出席できなくて、本当にごめんね。

I'm really sorry I couldn't attend your wedding.

ご一緒できなくて残念です。

It's a shame you can't join us.

長居はできなくて錠をかけ

I couldn't stay long, so I locked it.

— どん底作家の人生に幸あれ! (2019)

でも全然満足できなくて私の体は今でも熱いままよ

But I still can't get enough, and my body is still burning hot.

— オープン・ユア・アイズ (1997)

抱っこできなくて私たちって何?

If you can't even pick me up, what are we?

— クワイエット・プレイス (2018)

昨夜書くつもりが集中できなくて集中力に効く薬欲しい?

I was going to write last night, but I couldn’t concentrate. Do you want some medication to help with focus?

— JUNO/ジュノ (2007)

参加できなくて残念です。

It's a shame you can't join us.

悪天候のためゴルフができなくて、父は機嫌が悪かった。

My father was in a bad mood because he couldn't play golf due to the bad weather.