なんということもない => Nothing worth mentioning N3
Emphasize
...もの (こと) も...ない => Leave it as is N3
Emphasize
...というのも => The reason is N2
Cause, reason
いかなる…とも => whatsoever; whatever N3
Extreme example
…ものとおもっていた => Thought it was... N2
Vague
なんともおもわない => think nothing of N3
Invariant
いくら…といっても => no matter how ~ N3
Emphasize
いかに…といっても => no matter how N3
Modify
というものでもない => there is no guarantee that…; not necessarily ~ N2
~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
とても ... ない => cannot possibly be; hardly ~ N3
Emphasize negative meaning
…ひとつも…ない => cannot possibly be ~ N2
Evaluate