Prone to complaint; complaining, querulous.
Early 17th century; earliest use found in Robert Cawdrey (c1537–c1604), Church of England clergyman and lexicographer. From querimony + -ous.
“He’s far too demanding and far too querimonious for my liking.”
The last stage of life; old age.
Senectitude comes from the Medieval Latin noun senectitūdō meaning “old age,” which in turn comes from Classical Latin senectūs, a derivative of the noun senex meaning “old man.” Senectitude entered English in the late 1700s, more precisely, in 1796 in Jonathan Swift’s Gulliver’s Travels