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verb dress without sufficient warmth
underdress.
- She was underdressed for the hiking trip and suffered hypothermia
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verb dress informally and casually
underdress; dress down.
- On Fridays, employees can underdress
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adjective satellite inadequately or too informally clothed
WordNet
Un`der*dressed" adjective
Definitions
- Not dresses enough.
Webster 1913
Sharpen your Skills with the Masters
"Rowling never met an adverb she didn't like."
-Stephen King on J.K Rowling's excessive use of adverbs.
Fear not the Adverb Hell!