not worth a brass farthing

Adjective

idiomatic

(idiomatic) Worth nothing or next to nothing.

Japanese Meaning

全く価値がない / 取るに足らない

That old souvenir is not worth a brass farthing, but I keep it for sentimental reasons.

あの古いお土産はほとんど価値がありませんが、思い出のために取っておきます。

Sense（1）

(idiomatic) Worth nothing or next to nothing.

One's own private knowledge of a man's character is not worth a brass farthing as legal evidence.