少なくとも => at least ~ N2
ねばならない/ねばならぬ/ねば => have to do; must; should ~ N2
~ぬばかり => As if; as though N1
Situation
...ぬ => Not (Negative) N3
Emphasize negative meaning
もう少しで => almost; nearly, close to ~ N2
[少「すこ」]しも~ない => Not (even a little) A N3
Not only, Not even
にほかならない/からにほかならない => nothing but; none other than ~ N2
少しも~ない/ちっとも~ない => (not) at all; (not) in the least ~. N3
~ぬうちに => While not....; before... N1
Time
ぬきにして/~ぬきで => Exclude A; Stop/end A; Without A N2
Miscellaneous
~ぬまに => without one's knowledge, without noticing N1
Time
~とも~ともつかぬ/ともつかない      => whether A or B (shows doubt or uncertainty between the two things) N1