楽しんでた

was enjoying

→ 楽しむ
楽しん enjoy, have fun + で Te-form (conjunctive) + た Past tense
verb · informal, imperfect tense Rare #43,161
was enjoying Colloquial contraction of 楽しんでいた.
JA: 旅行中は、毎日の食事を楽しんでた。
EN: I was enjoying the meals every day during the trip.
Conjugation of 楽しむ
Indicative imperfect
楽しんでた

彼はいつものように楽しんでた

He was having fun as usual.

— 海の上のピアニスト (1998)

みんな楽しんでたよ。

Everyone was having fun.

仕事中は自分の音楽を楽しんでた

I enjoyed listening to my own music while I worked.

— 落下の解剖学 (2023)