Definify.com

Webster 1913 Edition

Adj.

[

Com

par.

Prosier

;

sup

erl.

Prosiest

Of or pertaining to prose; like prose.

Dull and tedious in discourse or writing; prosaic.

prosy ‎(comparative prosier, superlative prosiest)

Unpoetic (of speech or writing); dull and unimaginative.
Behaving in a dull way (of a person); boring, tedious.
- 1946, Bertrand Russell, History of Western Philosophy, I.19:
  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.

without imagination