antediluvian

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antediluvian /ˌæntɪdəˈluːvijən/ adjective
antediluvian
/ˌæntɪdəˈluːvijən/
adjective
Learner's definition of ANTEDILUVIAN
[more antediluvian; most antediluvian] formal
: very old or old-fashioned