Related Clues:

• Extreme, as pain
• Not quite right?
• Very perceptive
• Less than right?
• Type of triangle
• Like angles less than 90 degrees
• Less than 90 degrees, in geometry
• Severe, as pain
• It's never right
• Like severe pain
• Triangle type
• Having two equal sides
• Sharp-sighted
• Geometry term
• Triangle with two equal sides