The Latin prefix 'dis-' indicates 'the opposite of,' defining disastrous as 'under an unlucky star.'
The word 'disastrous' can be understood by looking at its Latin prefix dis-, which can mean 'the opposite of.' Based on this knowledge, disastrous would mean under an unlucky star, indicating something that brings great harm, damage, or misfortune.
Understanding the meaning of prefixes can help decode unfamiliar words in English and expand vocabulary.
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