1. in a mysterious, secret, or obscure manner; in a way that is known or understood by few people
Usage: formal; literary

Examples

• The ancient ritual was performed arcanely, with only initiated members present.
• She spoke arcanely about matters that few could comprehend.
• The organization operated arcanely, keeping its true purposes hidden from the public.
• He smiled arcanely, as if privy to secrets no one else possessed.
• The manuscript was written arcanely, using symbols and codes known only to scholars.