劳神费力 láoshénfèilì to tax one's mind and strength Origin Definitions Defs Strokes Stroke Words Sentences Sents 劳神 勞神 láoshén verb + noun to tire the mind To exert mental effort; to be mentally taxing or exhausting.费力 費力 fèilì adjective strenuous To expend a great deal of effort; to be strenuous or laborious.