Secret or hidden; conducted in a secretive or stealthy manner.
Rare English adjective derived from Latin 'clam' (secretly) with the suffix '-cular,' though this is a highly unusual formation and may be a back-formation or specialized coinage.
This word is so obscure it almost doesn't exist in modern English—lexicographers debate whether it's a real word or a misunderstanding of 'clandestine'!
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