If you describe a task or job as laborious, you mean that it takes a lot of time and effort. 费时费力的
adjective [原级] 耗时费力的，辛苦的；（尤指讲话，写作风格）造作的，不流畅的
Keeping the garden tidy all year round can be a laborious task. 保持院子全年整洁会是一项费时费力的任务。
