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The Collaborative International Dictionary
Insolidity

Insolidity \In`so*lid"i*ty\, n. [Pref. in- not + solidity: cf. F. insolidit['e].] Lack of solidity; weakness; as, the insolidity of an argument. [R.]
--Dr. H. More.

Wiktionary
insolidity

n. Lack of solidity; weakness.