[全「まった」]く~ない => Not A (at all; even a little bit) N3
Not only, Not even
めったにない => Rarely N3
Degree. Level, Amount
[決「けっ」]して~ない => Won’t, isn’t N3
Will, Decision, Doing
わけにはいかない => Must not A, Must A N3
Needs, Requirement
なくてはいけない => Must do A; have to A N4
Can, Should, Must
といったらない/といったらありはしない => Extremely A, Very A, A beyond description N1
Degree/ Level/Amount
に[難「むずか」]くない => It's not hard to A N1
Adjectival, Descriptions
て[頂「いただ」]けないでしょうか? => Could you please A for me? N4
Secondary Verb
かいもなく => Even though A, N2
Contrast,Surprise
に[限「かぎ」]った[事「こと」]ではない => It's not limited to A, it's not only A N1
Degree/ Level/Amount
おまけに => A. In addition, B N2
(Not)only, (Not) even
ずにはすまない/ないではすまない => A must be done N1
Potential, Possibility