энүүнтэй = энэнтэй = энэтэй The base word is "энэ", in Japanese it would be "こいつ". This word is used a lot together with its other form - энүүнгүй /энэнгүй/ энэгүй. For example: Энүүнтэй энүүнгүй миний ажил бүтнэ. My work will be a success with or without his / her help. Энэнтэй энэнгүй амьдарч чадна. I can live with or without him / her. Энэтэй энэгүй би болгочихно. I can do it with or without him / her / it.