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ostensible [ostensible 词源字典]: ostensible: [18] Ostensible means literally ‘that can be shown’. It comes via French from medieval Latin ostensibilis, a derivative of the Latin verb ostendere ‘show’ (itself a compound formed from the prefix ob- ‘in front of’ and tendere ‘stretch’, source of English extend, tend, tense etc). Its original meaning ‘showable’ survived into English (‘You should send me two letters – one confidential, another ostensible’, Jeremy Bentham, 1828), but seems to have died out by the mid-19th century.

Two metaphorical strands came with it, though. One, ‘vainly conspicuous’, goes right back to ostendere, and is still preserved in English ostentation [15], although it has disappeared as far as ostensible is concerned. The other, ‘presented as real but not so’, is today the central meaning of the adjective.
=> extend, ostentation, tend, tense[ostensible etymology, ostensible origin, 英语词源]
pine (n.): "coniferous tree," Old English pin (in compounds), from Old French pin and directly from Latin pinus "pine, pine-tree, fir-tree," which is perhaps from a PIE *pi-nu-, from root *peie- "to be fat, swell" (see fat (adj.)). If so, the tree's name would be a reference to its sap or pitch. Compare Sanskrit pituh "juice, sap, resin," pitudaruh "pine tree," Greek pitys "pine tree." Also see pitch (n.1). Pine-top "cheap illicit whiskey," first recorded 1858, Southern U.S. slang. Pine-needle (n.) attested from 1866.
Most of us have wished vaguely & vainly at times that they knew a fir from a pine. As the Scotch fir is not a fir strictly speaking, but a pine, & as we shall continue to ignore this fact, it is plain that the matter concerns the botanist more than the man in the street. [Fowler]
strut (v.): "walk in a vain, important manner, walk with affected dignity," 1590s, from Middle English strouten "display one's clothes proudly, vainly flaunt fine attire" (late 14c.), earlier "to stick out, protrude, bulge, swell," from Old English strutian "to stand out stiffly, swell or bulge out," from Proto-Germanic *strut- (cognates: Danish strutte, German strotzen "to be puffed up, be swelled," German Strauß "fight"), from PIE root *ster- (1) "strong, firm, stiff, rigid" (see stereo-).

Originally of the air or the attitude; modern sense, focused on the walk, first recorded 1510s. Related: Strutted; strutting. To strut (one's) stuff is first recorded 1926, from strut as the name of a dance popular from c. 1900. The noun meaning "a vain and affectedly dignified manner of walking" is from c. 1600.
vain (adj.): c. 1300, "devoid of real value, idle, unprofitable," from Old French vain, vein "worthless, void, invalid, feeble; conceited" (12c.), from Latin vanus "empty, void," figuratively "idle, fruitless," from PIE *wa-no-, from root *eue- "to leave, abandon, give out" (cognates: Old English wanian "to lessen," wan "deficient;" Old Norse vanta "to lack;" Latin vacare "to be empty," vastus "empty, waste;" Avestan va- "lack," Persian vang "empty, poor;" Sanskrit una- "deficient," Armenian unain "empty").

Meaning "conceited, elated with a high opinion of oneself" first recorded 1690s in English; earlier "silly, idle, foolish" (late 14c.). Phrase in vain "to no effect" (c. 1300, after Latin in vanum) preserves the original sense. Related: Vainly; vainness. Compare also vainglory.
vaunt (v.): early 15c., "speak vainly or proudly," from Anglo-French vaunter, Old French vanter "to praise, speak highly of," from Medieval Latin vanitare "to boast," frequentative of Latin vanare "to utter empty words," from vanus "idle, empty" (see vain). Also short for avaunten "to boast" (see vaunt (n.)). Related: Vaunted; vaunting.
would: Old English wolde, past tense and past subjunctive of willan "to will" (see will (v.)). Would-be (adj.) "wishing to be, vainly pretending" is first recorded c. 1300.