nescient
jackleg
naïveté
unconfinedness
unexploredness
undertalented
unsurpassableness
ungenteelness
uninterestedness
unbegottenness
undisputatiousness
undelightfulness
unappealingness
unmeekness
unpracticality
unvaryingness
untraceableness
learningless
jejuneness
weak
uncivilizedness
ungainfulness
untenantability
unadventuresomeness
untenantableness
vapidness
unprovableness
unquiescence
vapidity
unimposingness
jejunity
unappeasableness
uninspiredness
unbefittingness
tameness
unbenignity
unmeritoriousness
amateur
uncomprehendingness
untrendiness
unuprightness
not the sharpest knife in the drawer
not the sharpest tool in the box
not the sharpest tool in the shed
stultified
unlikability