わけがない— There's No Way

• あんなに練習したのに、負けるわけがない。

  Anna ni renshuu shita noni, makeru wake ga nai.

  After practicing that much, there's no way we'll lose.

  負ける (lose) + わけがない strongly denies the possibility of losing.

• 彼がそんな嘘をつくわけがない。

  Kare ga sonna uso o tsuku wake ga nai.

  There's no way he would tell such a lie.

  嘘をつく (tell a lie) + わけがない = the speaker is convinced it's impossible.

• この問題が簡単なわけがない。

  Kono mondai ga kantan na wake ga nai.

  There's no way this problem is easy.

  な-adj 簡単 takes な before わけがない to deny the quality.

• ・Register: neutral to casual; the shortened わけない is common in speech.
• ・Expresses subjective certainty grounded in reasoning, not a mere lack of evidence.
• ・Do not confuse with わけではない, which softly denies rather than flatly rejects.

Commonly confused with

The JLPT rarely asks whether you recognise a pattern — it asks which of several similar patterns fits. These are the ones わけがない is tested against.

• ～おそれがある — There Is a Risk That
• ～ことだ — You Really Should
• ～ことはない — No Need To
• ざるを得ない — No Choice But To
• っこない — No Way That'll Happen
• ～てみせる — I'll Show You I Can
• ～とは限らない — Not Necessarily So
• ～に決まっている — I'm Sure It Must Be