pedestrian (adj.)youdaoicibaDictYouDict[pedestrian 词源字典]
1716, "prosaic, dull" (of writing), from Latin pedester (genitive pedestris) "plain, not versified, prosaic," literally "on foot" (sense contrasted with equester "on horseback"), from pedes "one who goes on foot," from pes (genitive pedis) "foot," from PIE root *ped- (1) "a foot" (see foot (n.)). Meaning "going on foot" is first attested 1791 in English (it also was a sense of Latin pedester). The earlier adjective in English was pedestrial (1610s).[pedestrian etymology, pedestrian origin, 英语词源]
pedestrian (n.)youdaoicibaDictYouDict
"walker," 1793, from pedestrian (adj.).