In polite way 'muda desu' or 'muyou desu', less formal 'muda da'.
Yakunitata nai
Kanjō WA muyōdesu.
Another useless question
USELESS
You can say "inutile" to mean useless in French.
Another useless question
?
"Useless, Useless"
osama
bezpolezen..безполезен
economics is useless because it is based on assumptions made by economists............
you should say i went to the mall and bought a useless pair of shoes