The difference between Gro and Grotty
When used as adjectives, gro means disgusting, unpleasant, whereas grotty means unpleasant, dirty, slovenly or offensive.
check bellow for the other definitions of Gro and Grotty
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Gro as an adjective (US, slang):
Disgusting, unpleasant; gross.
Examples:
"Wash your hair! It's totally gro."
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Grotty as an adjective (slang, British, Canada, Australia, NZ):
unpleasant, dirty, slovenly or offensive