It is a spelling error.
People often assume that the suffix "-ous" can be directly appended to certain words following a common English spelling pattern. While this is true for many words, such as "dangerous" or "marvelous," the word "disaster" forms "disastrous" by dropping the "e" in its root before adding "-ous". This irregular formation can cause confusion.
"Disastrous" is the correct spelling. It is an adjective that means "causing great damage or suffering" or "extremely bad or unfortunate".
The error occurs due to the common confusion about the ... Learn more →
People make this error because "reign" and "rein" are homophones, ... Learn more →
People might mistakenly use "spoke" in place of "spoken" because ... Learn more →
People often confuse "principle" with "principal" because they sound similar ... Learn more →