無駄【むだ】
futility, waste, uselessness, pointlessness, idleness
無駄遣い【むだづかい】
waste (of money, time, etc.), squandering, frittering away
駄目【だめ】
no good, not serving its purpose, useless, broken, hopeless, wasted, in vain, purposeless, cannot, must not, not allowed, neutral point, intersection owned by neither player at the end of a game, no!, stop!
駄菓子【だがし】
penny candy, cheap individually wrapped sweets
下駄【げた】
geta, traditional Japanese wooden sandal, turn (in set-type proofing), upside-down character, net, geta