失败

to be defeated / to lose / to fail (e.g. experiments) / failure / defeat / CL:次[ci4]

to lose / to miss / to fail

to defeat / to damage / to lose (to an opponent) / to fail / to wither

loser

Failure is the mother of success.

utter failure

to succeed through failure / to achieve one's final aim despite apparent setback

to fail at every step of the way (idiom)

defeatism