Read Edit View history 費力 fèilì strenuous Origin Definitions Defs Strokes Stroke Words Sentences Sents Senses Add sense 费力/ 費力 fèilì strenuous To expend a great deal of effort; to be strenuous or laborious. Edit Delete References Add reference synonym 费力/費力 → 费劲/費勁 Edit Delete same_as 费劲/費勁 → 费力/費力 Edit Delete