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A person who's not the best looking, but not so bad you'd want to throw up. Your friends would forgive you for sleeping with them if you were drunk, but only if you were really, really drunk.
My cousin's ex is a forgivable. I slept with her once. I was drunk. I was also crying.
My brother dated a forgivable. He said she was okay. I said she was a mess.
My friend's girlfriend is a forgivable. He still loves her. I don't know how.