に足りない/に足らない => cannot; not worthy; not worth doing ~ N1
のみならず/のみか => not only; besides; as well as ~ N2
に足る => worthy; worth doing N1
てもみない => one has never thought... N4
Emphasize
のみ => only; nothing but​ N2
Limit, limit
を[踏「ふ」]まえて => Thinking of A N1
Based/focused/depending on
場合(は) => in the event of; in the case that ~ N4
... ないものは ...ない => is not entirely impossible N3
Ability
ものもV-ない => is not entirely impossible N4
Emphasize the negative meaning
たものではない => Impossible N2
Evaluate
ないものでもない/ないでもない => A is not completely impossible N1
Need/Requirements
てもみないで => How do you know until you try? N4
Emphasize