Disastrous is a related term of unfortunate.
As adjectives the difference between disastrous and unfortunate
is that disastrous is of the nature of a disaster; calamitous while unfortunate is not favored by fortune.
As a noun unfortunate is
an unlucky person.
disastrous
English
Adjective
(
en adjective)
of the nature of a disaster; calamitous.
foreboding disaster; ill-omened.
Synonyms
* (calamitous) cataclysmic, catastrophic
* (ill-omened) ill-boding, , sinister
Derived terms
* disastrously
unfortunate
English
Adjective
(
en adjective)
not favored by fortune
marked or accompanied by or resulting in misfortune
Synonyms
* (not favored by fortune) unsuccessful
* (accompanied by or resulting in misfortune) unlucky
Antonyms
* (not favored by fortune) fortunate
* (accompanied by or resulting in misfortune) fortunate, lucky
See also
* deplorable
* regrettable
* infelicitous
* unsuitable