antediluvian
an-tee-dih-LOO-vee-unadjMeaning extremely old or old-fashioned (often said as a joke)
Memory hook ANTE-DILUV: from BEFORE the FLOOD. Uncle Victor rides to town in a creaky wooden cart pulled by an old horse, while the kids zoom past on skateboards; his ride seems to date from before the great flood. It is antediluvian.
My uncle’s antediluvian computer takes ten minutes to start.
In context The students giggled at the teacher’s antediluvian slides, full of cartoons and fonts that had gone out of style before any of them were born.
Similar outdated, old-fashioned, obsolete, outmoded
Opposite modern, up-to-date, newfangled
From Latin ante (before) + diluvium (flood): literally, from before the great flood of ancient stories.