1. Lacking quickness of perception or intellect.
2. Characterized by a lack of intelligence or sensitivity: an obtuse remark.
3. Not distinctly felt: an obtuse pain.
I've only been reminded in the last few days constantly that I've let five years pass. I'm not being deliberately obtuse about it, but I wasn't aware of that time passing. I was quite happily engaged in other things. I set out to indulge my curiosity in other things, not just to get away from this work.