undemocratic
Used as a noun or adjectival noun to describe systems, actions, or attitudes that are not democratic. Often appears in political or social commentary.
The decision was criticized as undemocratic.
反民主 means 'anti-democratic', implying active opposition to democracy, while 非民主 simply means 'not democratic' or lacking democratic qualities.
Formed from the prefix 非 (hi-, 'non-') and 民主 (minshu, 'democracy' or 'democratic'). The prefix 非- is a common Sino-Japanese element for negation, similar to English 'non-' or 'un-'.