わけがない

expression

there is no way that ...; it is impossible that ...; cannot possibly ...

A strong negative judgment by the speaker that something is impossible, unreasonable, or cannot be true. Commonly follows a plain-form verb, adjective, or noun phrase.

• 子こどもがそんな重おもい荷に物もつを一人ひとりで運はこべるわけがない。

  There is no way a child could carry such heavy luggage alone.

• 彼かれがそんな約やく束そくを忘わすれるわけがない。

  He could not possibly forget a promise like that.

expression, i-adjective

easy; simple; no trouble

Adjectival use meaning that something presents no difficulty. This can be confused with the much more frequent grammar pattern 'there is no way that ...', so context such as 彼には or そのくらいなら is important.

• そのくらいの暗あん算ざんなら、彼かれにはわけがない。

  Mental arithmetic at that level is easy for him.

• 慣なれれば、この作さ業ぎょうはわけがない。

  Once you get used to it, this task is no trouble.