We found one dictionary that defines the word unsmeltable:

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1. unsmeltable: Wiktionary

Definitions from Wiktionary (unsmeltable) ▸ adjective:  Not smeltable. ▸ Words similar to unsmeltable ▸ Usage examples for unsmeltable ▸ Idioms related to unsmeltable ▸ Wikipedia articles (New!) ▸ Popular nouns described by unsmeltable ▸ Words that often appear near unsmeltable ▸ Rhymes of unsmeltable ▸ Invented words related to unsmeltable