There are many levels of 'not understanding'. Few people understand Quantum Theory; most people understand that water is wet. Why must you label them? Help them understand, and if for whatever reason they are not interested, move on. If you need a label, try uninformed, unaware, naive...
She probably doesnt like you or understand what you want
Stubborn
someone that doesnt like talking or looking at people
jewish.... or a vegetarian... or a vegan
Alert.
a dolley is someone that doesnt work.
You can refer to them as "Someone who is puzzled" or "Someone who is unclear about it".
Shy or timid.
One name for this is a "religious chauvinist"
jewish.... or a vegetarian... or a vegan
You can't phone them if they don't have a phone.
If someone calls you complex, its means that they don't understand you, your hard to fugure out.