What is a synonym for obscured?

Obscure has numerous synonyms depending on which meaning is used. When it means uncertain, it is also "dubious." When it means something is not clear, it is also "arcane." If it means not important, it is "insignificant." It means vague, it is also "hazy." When it hides something, it can "veil" it. If it makes something difficult, it is also "confuses."