Definition of supersubtle in English:
supersubtle
(also supersubtile)
adjective ˌsjuːpəˈsʌtlˌsuːpəˈsʌtl
Extremely or excessively subtle; oversubtle.
Origin
Early 17th century; earliest use found in Edwin Sandys. From super- + subtle. With some forms compare subtile and the discussion at that entry.