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effrontery: effrontery: [18] The notion of ‘audacity’ or ‘impudence’ is often expressed in terms of ‘exposing or pushing forward the face’: a ‘barefaced lie’ or ‘putting on a bold front’, for instance. And effrontery is no exception. It comes ultimately from late Latin effrōns ‘barefaced, shameless’, a compound adjective formed from the prefix ex- ‘out of’ and frōns ‘forehead’ (source of English front).

This seems subsequently to have been reformulated along the lines of its original components, giving Vulgar Latin *exfrontātus, source of Old French esfronte. This in turn developed to French effronté, whose derived noun effronterie was acquired by English as effrontery.
=> front
airing (n.): "action of exposing to air," c. 1600, from present participle of air (v.). Meaning "display, public exposure is from 1870.
dressy (adj.): 1760s, from dress (v.) + -y (2).
"For as her natural face decays, her skill improves in making the artificial one. Well, nothing diverts me more than one of those fine, old, dressy things, who thinks to conceal her age by everywhere exposing her person; sticking herself up in the front of a side-box; trailing through a minuet at Almack's; and then, in the public gardens looking, for all the world, like one of the painted ruins of the place." [Goldsmith, "The Good Natured Man," 1768].
expose (v.): early 15c., "to leave without shelter or defense," from Old French esposer, exposer "lay open, set forth, speak one's mind, explain" (13c.), from Latin exponere "set forth, lay open, exhibit, reveal, publish" (see expound), altered by confusion with poser "to place, lay down" (see pose (v.1)). Meaning "to exhibit openly" is from 1620s; that of "to unmask" is from 1690s. Photographic sense is from 1839. Related: Exposed; exposes; exposing.
exposure (n.): c. 1600, "public exhibition," from expose (v.) + -ure. Sense of "situation with regard to sun or weather" is from 1660s. Photographic sense "act of exposing to light" is from 1839. Indecent exposure attested by 1825.
over-expose (v.): 1869, in photography, from over- + expose (v.). Figurative sense, in reference to celebrity, first attested 1969 (implied in overexposure). Related: Over-exposed; over-exposing.
ventilation (n.): "process of replacing foul air in an enclosed place with fresh, pure air," 1660s, from Latin ventilationem (nominative ventilatio) "an exposing to the air," noun of action from past participle stem of ventilare (see ventilate).