like let's say you're full, you could say "gen men 没办法吃饭“
I think similarly gen men would be used as 完全
"完全没办法吃饭"
But I can't find the characters for "Gen Men". I think I have the pinyin wrong? does anybody know what I"m talking about?
You are probably looking for the word 根本 (gen1 ben3) which means "completely" in your context.