prosy

adj

1. Unpoetic; dull and unimaginative.
2. Behaving in a dull way; boring, tedious.

   “CHARMIAN. He makes you so terribly prosy and serious and learned and philosophical. It is worse than being religious, at our ages.”

   “"Well, well, we all get a bit prosy sometimes," said Lord John.”

   “I cannot imagine his pupil regarding him as anything but a prosy old pedant, set over him by his father to keep him out of mischief.”