Definition of non-obvious in US English:

non-obvious

adjective

  • Not obvious; not immediately apparent or such as would ordinarily be expected; (specifically in patent law) not disqualified by obviousness from being patentable. Occasionally as noun: that which is not obvious.

Origin

Late 19th century. From non- + obvious.

Pronunciation

non-obvious

/nɒnˈɒbvɪəs/