RichThesaurus
morbose
vs
sick as a parrot
morbose
adj
Proceeding from disease; morbid; unhealthy.
sick as a parrot
adj
extremely sick; very ill.
Very disappointed; miserable.
How often have the words
morbose
and
sick as a parrot
occurred in a corpus of books?
(source:
Google Ngram Viewer
)