vetusty means antiquity; great age. Lexicurio rates it Sui generis — a strength score of 88 out of 100.
Why “vetusty” is a great word
The quality of being ancient or possessing great age. From Latin *vetustās* ("antiquity, old age"), from *vetus* ("old"). First attested in English in the 1870s. Unlike "antiquity," which names a historical epoch, or "senescence," which describes an active process of decline, vetusty is the quiet condition itself—the accumulated weight of centuries. It is the deep, dry smell of papyrus in a sealed library, the coolness of river-smoothed stone, and the profound silence of a mountain that has witnessed every empire: the quality of time made palpable and still.
Etymology
From Latin vetustās.