Natter
navy
needy
natural nonchalant
Navigating.
The word you are looking for is probably - legerdemain. Another synonym for sleight of hand is - Prestidigitation.
The words could be negligent (failing to observe care) or nonchalant (apathetic).
naughty
No, except at the beginning of a sentence because it is n ot a proper n ou n.
Notice
Nemisis
neutron
nanny