προφητειας noun - accusative plural feminine
propheteia  prof-ay-ti'-ah: prediction (scriptural or other) -- prophecy, prophesying.
μη particle - nominative
me  may: any but (that), forbear, God forbid, lack, lest, neither, never, no (wise in), none, nor, (can-)not, nothing, that not, un(-taken), without.
εξουθενειτε verb - present active middle - second person
exoutheneo  ex-oo-then-eh'-o: contemptible, despise, least esteemed, set at nought.