wú​yòng​gōng

useless effort

无用功 無用功 wú​yòng​gōng
useless effort
Useless work; unproductive labor; a waste of effort.
wasted work
(physics) The energy or work expended by a machine to overcome internal friction or other resistance rather than producing the intended output.

Frequency

Movie subtitles
0.950 per million appears in 0% of films
Written text
0.439 per million

Sources