beyond one's ken
extramental
superintellectual
area of authority
shallow
unbelievable
incredible
book smart
sure
immanent
put it past
monomath
metempirics
inscient
over one's head
in one's head
self-knowing
unknowing
T-shape
practic
test
transcendent
Gnostic
quiz
unknowledge
whistle in the dark
T-shaped
knowledgeless
Orphic
huckleberry above one's persimmon
supramundane
catch
get
supermundane
bimental
grok
ken
idealist
generalist
incognizant
arcane
the penny drops
clueless
know of
extrapsychic
dreamer
as far as one knows
well-grounded
ignorantist
know one's ass from a hole in the ground