禁止形 => Negative imperative form N4
的 => about (change noun into na-adjective or adverb) N3
[禁止「きんし」] => Don't do N4
Can, Should, Must
…のも無理 (は) ない => It's natural for... N3
Evaluate
のも無理もない => (to be) natural,(to be) understandable N3
Evaluate