don't worry about it; there is nothing to fear; there is no need for anxiety; everything is under control
there being no use in arguing (about it); not up for discussion
not a word to anyone; keep it secret; mum's the word
don't worry about it; there is nothing to fear; there is no need for anxiety; everything is under control
useless object; deadwood; white elephant; boondoggle
usefulness for the (seemingly) useless
there's no point in staying (here) any longer; there's no point in prolonging a (the) visit; there's no point in extending one's stay