modality N1 uncommon casualwritten

〜には無理がある — ~ is unreasonable / unrealistic

〜には無理がある・にはむりがある

Meaning

there's a stretch/flaw in ~ / ~ is unreasonable — points out that a claim or plan is forced and doesn't hold up

その言いい訳わけには無理むりがある。

That excuse is a stretch.

Attaches to	Form	Example
Noun, or verb dictionary form + の	N／V-るの + には無理むりがある	この説明せつめいには / 全部ぜんぶ覚おぼえるのには

一日いちにちで全部ぜんぶ覚おぼえるのには無理むりがある。

Memorizing it all in a single day is unrealistic.

彼かれ一人ひとりに責任せきにんを負おわせるのには無理むりがある。

It's unreasonable to put all the responsibility on him alone.

この理論りろんには、どこか無理むりがある。

There's something forced about this theory somewhere.

Note the difference from a bare 無理むりだ ('it's impossible'): 無理むりがある says a flaw or strain EXISTS in something — it's partly unworkable or doesn't quite add up — rather than flatly ruling it out.

Jengo shows 〜には無理がある the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.

Sources Compiled from published Japanese grammar references.