on-and-off

Adjective

not-comparable

Vacillating, undecided, intermittent.

Japanese Meaning

断続的な（一定でなく、途切れ途切れに起こる様子） / 優柔不断な（意志や決断が定まらない状態）

Her on-and-off commitment to the project frustrated the whole team.

彼女の断続的なプロジェクトへの取り組みはチーム全体を苛立たせた。

Sense（1）

Vacillating, undecided, intermittent.

We had an off-and-on relationship and eventually broke up.

off-and-on

（ canonical ）