dotard

1. (archaic) An old person with impaired intellect; a senile person; one in their dotage.Examples: "Dotard, (ſaide he) let be thy deepe aduiſe; Seemes that through many yeares thy wits thee faile, And that weake eld hath left thee nothing wiſe, Els neuer ſhould thy iudgement be ſo frayle, To meaſure manhood by the ſword or mayle."; "I ſpeake not like a dotard, nor a foole, As vnder priuiledge of age to bragge, What I haue done being yong, or what would doe, Were I not old, […]"; "The man who had ſome virtue whilſt he was ſtruggling for a crown, often becomes a voluptuous tyrant when it graces his brow; and, when the lover is not loſt in the huſband, the dotard, a prey to childiſh caprices, and fond jealouſies, neglects the ſerious duties of life, and the careſſes which ſhould excite confidence in his children are laviſhed on the overgrown child, his wife."Synonyms: mimmerkinarchaic

2. (obsolete) One who dotes on another, showing excessive fondness; a doter.obsolete