say it: di-ZA-struh-slee
disastrously is an adverb meaning "in a disastrous manner". It carries one recorded sense.
in a disastrous manner
“the real value of the trust capital may be disastrously less than when the trust began”
Definitions, synonyms and semantic relations for disastrously come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.