Scrabble Dictionary

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Yes, obtuse is playable

...and is worth 10 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Obtuse" Definition

adjective

Botany. Having a blunt or rounded tip: an obtuse leaf.
Characterized by a lack of intelligence or sensitivity: an obtuse remark.
Having an obtuse angle: an obtuse triangle.
Lacking quickness of perception or intellect.
Not distinctly felt: an obtuse pain.