1. most lacking in intelligence or understanding; most slow to comprehend
Usage: superlative form of obtuse
2. most blunt or not sharp; having the greatest angle (greater than 90 degrees)
Usage: superlative form of obtuse; mathematical/geometric

Examples

• He was the obtusest student in the class, never grasping even simple concepts.
• Her obtusest remarks showed she completely missed the point of the discussion.
• The obtusest angle in the triangle measured 120 degrees.
• Among all the tools, this knife had the obtusest edge.
• The obtusest member of the group failed to understand the obvious hints.
• The obtusest corner of the building created an awkward architectural feature.