American Dictionary of the English Language

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OBTU'SE, adjective [Latin obtusus, from obtundo, to beat against.]

1. Blunt; not pointed or acute. Applied to angles, it denotes one that is larger than a right angle, or more than ninety degrees.

2. Dull; not having acute sensibility; as obtuse senses.

3. Not sharp or shrill; dull; obscure; as obtuse sound.