非常勤

Its kanji

• 非 ヒ · あら.ず un-, mistake, negative, injustice, non-
• 常 ジョウ · つね、とこ- usual, ordinary, normal, common, regular, continually, always, long-lasting
• 勤 キン、ゴン · つと.める、-づと.め、つと.まる、いそ.しむ diligence, become employed, serve