Talk:in-

Current asymmetrical pairs regarding in- vs un-
Fowler reads a) adjective/noun pairs: unable, inability; uncivil, incivility; unequal, inequality; unjust, injustice; unquiet, inquietude. b) un- words ending in -ed: uncompleted, incomplete; undigested, indigestible; undisciplined, indiscipline; unreconciled, irreconcilable; unredeemed, irredeemable; unseparated, inseparable (the only indisputable in- -ed word is inexperienced ) c) un- words ending in -ing: unceasing, incessant; uncomprehending, incomprehensible; undiscriminating, indiscriminate.

Latin prefix vowel lengthening rules?
About Latin Etymology 2 (Prefixation of the preposition, ): do we know when the prefix ends up lengthened ? 2A02:1812:1126:5D00:58FC:AE30:C90B:1969 16:08, 25 December 2022 (UTC)
 * It's the application of a more general rule that the combination of a vowel plus n before an s and f represented a long nasalized vowel (see on Wikipedia). One piece of evidence was that the n was sometimes omitted: censor &rarr; cesor, consul &rarr; cosol, inferos &rarr; iferos. So it's the convention to add a macron to a vowel before ns or nf. The combination of vowel with macron plus n represents a long nasalized vowel, not a long vowel and then a distinct consonantal sound,  or . — Eru·tuon 17:00, 25 December 2022 (UTC)