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Results found in several dictionaries: Collins, Collaborative Dictionary
indesmallable   adj 
[medias] 
ladder-proof, run-resist

Collaborative Dictionary     Spanish-English
indesmallable exp. run-resist Reverso General Dictionary 
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'indesmallable' also found in translations in English-Spanish dictionary
runproof exp. indesmallable Reverso General Dictionary 

"Collins Spanish Dictionary 8th edition published in 2005 © William Collins Sons & Co Ltd 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005"