In Jain Dharma, liquor/alcohol (madya) is considered highly harmful and forbidden, because it causes intoxication, loss of awareness, and increases violence, attachment, and delusion.

Regarding the term “Maha Vighai”:

• In common Jain usage, madya is treated as a serious prohibited item.
• Different traditions may use different lists or wording for vighai / mahavighai.
• So, yes, liquor is definitely considered completely improper and highly दोषपूर्ण in Jain ethics, even if the exact label “Maha Vighai” is used differently across traditions.

In short: Liquor is absolutely not acceptable in Jain conduct.