書いてない

not writing, haven't written

→ 書く
書い write + Te-form (conjunctive) + ない Negative
verb · indicative Rare #25,883
not writing, haven't written Colloquial contraction of 書いていない.
JA: まだ手紙を書いてない。
EN: I haven't written the letter yet.
Conjugation of 書く
Indicative
書かない書いてない

何も書いてないんだろう

You didn't write anything, did you?

— 鏡 (1975)

壁が崩壊して以来書いてないと聞いた

I heard you haven't written since the wall collapsed.

— 善き人のためのソナタ (2006)

あなたが書いた私は書いてない

You wrote it in the book, not me.

— ダーク・プレイス (2015)

いや書いてない

No, I didn't write it.

何も書いてない

There's nothing written.

— アメリ (2001)

まだトム手紙書いてないんだ

I haven't written to Tom yet.

私の筆跡に似てるけど、私は書いてない

It looks like my handwriting, but I didn't write it.

書いてないんです

I haven't written it.

— いまを生きる (1989)