Usage Note
Loco is a colloquial adjective meaning crazy or mad, borrowed from Spanish and used informally in French slang. It is invariable in French (il est loco / elle est loco) and is more common among younger speakers. The seed POS lists it as adverb, but it functions primarily as a predicative adjective in attested French use.
Examples
"Ce type est complètement loco."
Natural Translation
That guy is completely crazy.
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