inconvertible, untransmutable
(adjective) not capable of being changed into something else; “the alchemists were unable to accept the inconvertible nature of elemental metals”
Source: WordNet® 3.1
untransmutable (not comparable)
not transmutable
Source: Wiktionary
12 June 2025
(noun) a decrease in the density of something; “a sound wave causes periodic rarefactions in its medium”
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