unobvious

adjectives

not immediately apparent
"in mathematical science connections are exhibited which...are extremely unobvious"- A.N.Whitehead
unobvious
antonym
obvious
is similar to
not readily apparent
"the answer was at first unapparent"
unapparent
is similar to
not provable
"it was both unproved and unprovable"
unprovable
is an attribute of
the property of being easy to see and understand
noticeability, noticeableness, obviousness, patency