bumplessadj.
/ˈbʌmpləs/, U.S. /ˈbəmpləs/ That has no bump or bumps (in various senses of bump n.2); lacking in bumps (literally or figuratively).In early use with reference to phrenology: cf. bump n.2 1b.
ΚΠ
1840 Amer. Turf Reg. & Sporting Mag. Mar. 108 Pity..[is] an imperceptible and bumpless organ in the fowler.
1861 O. W. Holmes Elsie Venner xii. 151 Two or three notabilities of Rockland, with..glabrous, bumpless foreheads.
1914 Pacific Municipalities June 280/2 The bumpless road, instead of being a total stranger to the motorist is becoming a well known friend.
1957 Life 28 Oct. 42/3 (caption) The rocket's nose..opened up like a flower after a graceful, bumpless landing.
1988 Computer Weekly 28 Apr. 12/1 His association with..start-up Encore..was not entirely bumpless.
2000 Sunday Mail (Queensland) (Nexis) 27 Aug. (Body and Soul section) 8 Now..mums-to-be can look just as chic as their bumpless friends.
This entry has been updated (OED Third Edition, September 2018; most recently modified version published online December 2021).
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adj.1840