問答無益 もんどうむえき there being no use in arguing (about it); being stone-deaf to someone's appeals n yoji Advanced ➥
無学文盲 むがくもんもう ignorant and illiterate; uneducated and illiterate; uneducated and illiterate person adj-no adj-na n sens yoji Advanced ➥
無為無能 むいむのう idle and incompetent; accomplishing nothing significant nor being capable of doing so; lacking the talent to do anything but idle away one's time n adj-na yoji Advanced ➥