kilométrico
kilometre-long, endless
adjective kee-loh-MEH-tree-koh Rare
Usage Note
Kilométrico rarely means literally 'measured in kilometres' — its dominant colloquial use is hyperbolic, describing anything perceived as extremely long: una cola kilométrica (an endless queue) or un discurso kilométrico (a never-ending speech). The literal adjectival sense (relating to kilometres, as in distancia kilométrica) is secondary. A fun false friend: English 'kilometrical' barely exists.
Examples
"Había una cola kilométrica en la entrada."
Natural Translation
There was an endless queue at the entrance.

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