Green’s Dictionary of Slang

sincanter n.

[despite Harvey’s proposed ety.,1597, more likely Fr. cinquante, fifty, which in 16C was considered old]

a contemptuous or depreciatory term applied to men, usu. as old….

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[UK]G. Harvey Trimming of Thomas Nashe E: Then thou callest them sinckanters, which is a proper Epithite vnto thy-selfe, for Sinckanter commeth of sincke and antrum a hole.