Synonyms of 'horrendous'
in the sense of dreadful
extremely disagreeable or shocking
They told us the dreadful news.
in the sense of frightening
The number of youngsters involved in crime is frightening.
in the sense of frightful
very alarming or horrifying
refugees trapped in frightful conditions
from hell (informal),
hellacious (US, slang)
in the sense of ghastly
a particularly ghastly murder
in the sense of grim
unfavourable and worrying
They painted a grim picture of growing crime.
in the sense of grisly
causing horror or dread
a series of grisly murders
in the sense of huge
Several painters were working on a huge piece of canvas.
humongous or humungous (informal)
in the sense of massive
(of objects) large, bulky, heavy, and usually solid
a massive steam boat
humongous or humungous (informal),
in the sense of shocking
very bad or terrible
I must have been in a shocking state last night.
Thesaurus for horrendous from the Collins English Thesaurus