呆気ない: disappointingly lacking in some way

(sports) match, game

end; conclusion; finish / death; collapse; fall

end, conclusion / end-of-life, death

to end, to finish, to quit / to be in a hopeless position

unsatisfying and disappointing

singles (in tennis)

(Internet slang) a dead fad; out of fashion; no longer trendy

(mathematics) quod erat demonstrandum (that which was to be proved)

(informal) to have "won" a match on a psychological or personal level despite losing to all appearances