monstrous

Short definition from Wiktionary

Adjective

1. 1
   Hideous or frightful.
2. 2
   Enormously large.
3. 3
   Freakish or grotesque.
4. 4
   Of, or relating to a mythical monster; full of monsters.
5. 5
   Marvellous; exceedingly strange; fantastical.
6. 6
   A severe insult that is used to describe a disabled person.