Hell is described as

a place where the fire never goes out, Mk 9:43
a place where ‘their worm does not die’, Mk 9:48
a place of darkness, Mt 8:12; 22:13; 25:30; 2 Pet 2:17; Jude 14
a lake of fire, Rev 19:20; 20:10,14,15; 21:8
a place where we may be ‘beaten with blows’, Lk 12:47
a place of ‘weeping and gnashing of teeth’, Mt 8:12; 13:42; 22:13; 24:51; 25:30
a place in which people are ‘shut out from the presence of the Lord’, 2 Thess 1:9

‘Even when we affirm that this language is metaphorical, and the suffering concerned is accordingly essentially mental and spiritual rather than physical, the presence of some profound degree of conscious anguish is inescapable. Hell is terrible by any measure and, as Jesus indicates, everything is worth sacrificing in order to avoid it. There is no more terrible prospect conceivable than of being consigned to hell.’ (Milne)