недей

Etymology
Fused imperative of.

Usage notes
Used to give prohibitive orders to a single addressee. Two interchangable constructions are possible:
 * недей + да + finite verb in 2p. sg. present tense:


 * недей + truncated infinitive stem (without the old ending):

Interjection

 * 1) don't [do that]! (addressed to a single person)