徒劳无功

to work to no avail (idiom)

not to have / no / none / not / to lack / un- / -less

to toil / labor / laborer / to put sb to trouble (of doing sth) / meritorious deed / to console (Taiwan pr. [lao4] for this sense)

meritorious deed or service / achievement / result / service / accomplishment / work (physics)

surname Tu

disciple / apprentice / believer / on foot / bare or empty / to no avail / only / prison sentence

disciple; apprentice; believer / on foot / bare; empty / to no avail / only / prison sentence

futile