Emily Dickinson Lexicon

OB-TUSE, a. [L. 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. Milton.
3. Not sharp or shrill; dull; obscure; as, obtuse sound.