1) Blah 2) Commonplace 3) Commonplace or dull 4) Dull and lacking excitement 5) French word used in English 6) Humdrum 7) Lacking imagination 8) Lacking imagination, dull 9) Lacking wit or imagination 10) Mundane 11) Not challenging 12) Not fanciful or imaginative 13) Unimaginative 14) Unrhetorical 1) Blah 2) Commonplace 3) Dry 4) Humdrum 5) Lacklustre 6) Lyrical 7) Matter of fact 8) Ordinary 9) Pedestrian 10) Prosy 11) Unglamorous 12) Unglamourous 13) Uninteresting 14) Unrhetorical 15) Workaday 
• (a.) Alt. of Prosaical
everyday mundane commonplace trite pedestrian 
commonplace or dull; matter-of-fact or unimaginative: a prosaic mind. · of or having the character or form of prose rather than poetry.
[SAT terms] not challenging; dull and lacking excitement not fanciful or imaginative