monstrous

adj.

[1]	awful , horrible , horrid , horrific , horrendous , horrifying , hideous , ugly , nightmarish , dreadful , heinous , grisly , gruesome , disgusting , nauseous , nauseating , repulsive , repellent , revolting , frightful , grotesque , hellish , ghoulish , freakish , fiendish , barbaric , barbarous , savage , inhuman , merciless , ruthless , brutal , brutish , beastly
[2]	outrageous , atrocious , flagitious , shocking , scandalous , grievous , atrocious , appalling , wicked , villainous , evil , vile , insensitive , cruel , base , debased , shameful , shameless , infamous , disgraceful , nefarious , egregious , foul , vicious , flagitious , loathsome , depraved
[3]	gigantic , grotesque , giant , huge , vast , enormous , colossal , monster , gargantuan , jumbo , immense , tremendous , titanic , prodigious , massive , towering , elephantine , mammoth