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Indissoluble entered the English language close on the heels of its antonym "dissoluble" ("capable of being dissolved"). "Dissoluble" (from Latin dissolubilis) first appeared in print in 1534, and "indissoluble" (with its "in-" prefix) followed in 1542. Dissolubilis derives from "dissolvere" ("to loosen" or "to dissolve"), which in turn comes from "dis-" ("apart") and "solvere" ("to loosen"). Not surprisingly, "dissolvere" is also the source of "dissolve" and "dissolvable," among other words. Is there an "indissolvable"? Yes and no. It exists, but it is archaic and rare. The word most likely to be used for things that cannot be dissolved in a liquid is "insoluble." "Indissoluble" generally refers to abstract entities, such as promises or treaties, that cannot be dissolved.
First Known Use of indissoluble
INDISSOLUBLE Defined for English Language Learners
Definition of indissoluble for English Language Learners
: impossible to destroy, break up, or get rid of
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