どことなく => Somewhere N2
Vague
くないです => Adjective negation N5
Emphasize the negative meaning
ことなく => without doing something even once N2
ことなく => Without doing A once (expressed strongly) N2
Will, Decision, “Doing”
昼となく夜となく => day and night N1
Continuous
[少「すこ」]しも~ない => Not (even a little) A N3
Not only, Not even
ながす => glance through N2
Demonstrate by example
なおす => to redo N3
Modify
なければならない/なくてはならない/なければいけない/なくてはいけない/なければだめ/なくてはだめ => must N5
ないことはない/ないこともない => can do; is not impossible to ~ N3
(の) なら~するな => If...then don't... N3
Condition (hypothetical condition)
なんとなく => for some reason, somehow N3
Vague