antediluvian

Of or belonging to the time before the biblical Flood; ridiculously old-fashioned.

• (no common derivatives)

• antediluvian attitudes
• antediluvian technology
• antediluvian views
• positively antediluvian

1. 1.His antediluvian views on women's roles in society belonged in the 19th century. (hopelessly outdated)
2. 2.The office still used antediluvian computers that took five minutes to boot up. (ancient, obsolete)

• archaic/ɑːˈkeɪɪk/— very old
• antiquated/ˈæntɪkweɪtɪd/— outdated
• prehistoric/ˌpriːhɪˈstɒrɪk/— extremely old, informal

from Latin "ante" (before) + "diluvium" (flood) — before the Great Flood — from the earliest era imaginable