Knotty question synonyms | phrases

Phrases with similar meaning for Knotty question

• brain-twister

  brain-teaser
• closed book

  brain-teaser
• mind-boggler

  brain-teaser
• tough nut to crack

  brain-teaser
• tough proposition

  brain-teaser
• vexed question

  difficult question
• fine point
• fine question
• burning question
• brain-teaser
• difficult question