Date: 2011-07-06 07:21 pm (UTC)
From: [identity profile] lil-shepherd.livejournal.com
For what it is worth, from the OED

unˈfeasible, adj.

(un- prefix1 7, 5b.)

1527 in State Papers Henry VIII (1830) I. 247 As the discripcion‥shulde be to tedious‥to rede, so the explicacion therof shulde be unfaysible unto me.
1648 J. Beaumont Psyche xviii. ccxix. 363 But seeing this unfeasible, the sight Redoubled her compassionate sorrows weight.
1658 G. Starkey Natures Explic. 145 This Logick would make almost all Mechanicks to be impossible, if what ever you cannot do must straight be unfecible.
1672 O. Walker Of Educ. i. v. 36 Harshnes is discovered in‥enjoyning things in themselves too difficult, unfesible, and unsupportable.
1804 H. T. Colebrooke Remarks Husbandry & Commerce Bengal (new ed.) 35 Circumstances that render it unfeasible to enter these fields to select the ripe plants, without damaging the rest.
1886 Brit. Med. Jrnl. 12 June 1142/2 The use‥is doubtless charming in theory,‥but, in practice, it is unfeasible.


infeasible, adj.

Pronunciation: /ɪnˈfiːzəb(ə)l/
Forms: Also 15 -faisible, 16 -fesible, -fe(a)cible, 16–18 -feasable.
Etymology: < in- prefix3 + feasible adj. Compare French infaisable (17th cent. in Hatzfeld & Darmesteter).(Show Less)

Now rare. (My bolding)

Incapable of being accomplished or carried out; impracticable, impossible.

1533 in State Papers Henry VIII (1849) VII. 497 Ye shall say that ye remember ye herd Hym say oones, He wold neuer conclude that mariage, but to do Us good, whiche is nowe infaisible.
1646 Sir T. Browne Pseudodoxia Epidemica iii. xii. 135 Which secrets, although extreamly difficult, and tantum non infesible, yet are they not impossible.
1661 J. Glanvill Vanity of Dogmatizing xii. 109 This is so difficult; and‥so almost infeasable.
1678 S. Butler Hudibras iii. iii. 216 Therefore I hold no course s' infesible As this of force to win the Jesabel.
1704 N. N. tr. T. Boccalini Lett. from Apollo i. 194 Judging the Attempt infeasable.
1827 H. Hallam Constit. Hist. Eng. II. xiv. 416 Designs which the rising spirit of the nation rendered utterly infeasible.
1881 19th Cent. No. 48. 239 They pronounced it not only infeasible, but of very doubtful benefit, even could it be carried out.

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