Causing or worthy of vomiting; extremely unpleasant or disgusting.
Formed from 'barf' (mid-20th century slang for vomit) plus the suffix '-ful' (from Old English, meaning 'full of'). This is a newer colloquial formation rather than a formal English term.
Words ending in '-ful' have been used productively in English for over a thousand years to turn nouns into adjectives, so even though 'barful' is quite modern and slangy, it follows an ancient pattern that makes it instantly understandable.
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