condone (verb) – excuse = to let something pass that you don’t approve of

condonable (adjective) – excusable

Examples:

He forgot to buy her flowers, but she condoned it.

He condoned her occasional outbursts of bad temper.

Pro-life activists can’t condone abortion.

Racism in any form can’t be condoned.

Discrimination isn’t condonable either.

Her parents didn’t think it condonable that she got such a bad report card, because she was such a bright student.