The negative verb or negation verb; not, be not, do not, etc.
köken: The indicative forms are from Proto-Finnic *e-, from Proto-Uralic *e- ~ *ä- ~ *a- (negative verb stem). The imperative forms are from Proto-Finnic *älä-, from the Proto-Finno-Ugric negative imperative verb stem *älä- ~ *elä-. Details and cognates Noteworthy forms include eivät (replacing earlier evät by influence from the third-person singular ei). For more forms, see the Proto-Finnic and…
aile: ehkei, ehtyä, ei-, ei lainkaan, ei ollenkaan, eih, eikä, eiköhän, eittämättä, eittää
köken: Etymology tree Proto-Indo-European *né Proto-Balto-Slavic *ne Proto-Slavic *ne Old Czech ne Czech ne Inherited from Old Czech ne, from Proto-Slavic *ne.
/ina/ → /ija/ → /ije/ → /iːe/ First cited to the late 1600s. Shift from いや (iya), from even earlier 否 (ina). While いや (iya) was broadly used in the Muromachi period, in the Edo period, いや (iya) shifted to use mainly in informal or more intimate contexts, while いいえ (īe) was used in more formal or polite contexts. いや (iya) is still in use, including broader senses not included for いいえ (īe).