A form used only in the phrases his, thy, etc., thankes, of his, thy, etc., accord; voluntarily.(noun)
The Century Dictionary (Public Domain)
Use "thankes" in a sentence
"Example: “Ye knowen wel that euery lusty knight, / that loueth paramours and hath his might / Were it in Engelond or elliswhere / They wold hir thankes wilnen to be there.” ‘hir’ is a ME form of ‘their’ re: pragmatics: When an antecedent is semantically male, male pronouns are used."
"The woman gladly did as he desired, and Landolpho returning her infinite thankes, for the loving kindnesse shee had affoorded him, throwing the sacke on his necke, passed by a Barke to Brundusiam, and from thence to Tranium, where Merchants in the City bestowed good garments on him, he acquainting them with his disasterous fortunes, but not a word concerning his last good successe."
"Take this Morter and Pestell, beare them home to Belcolore, and tell her: Sir Simon sends them home with thankes, they having sufficiently served his turne, and desire her likewise, to send me my Cloake, which the Boy left as a pledge for better remembrance, and because she would not lend it without a pawne."