かねない => Afraid that N2
Potential, Possibility
ねばならない/ねばならぬ/ねば => have to do; must; should ~ N2
ねばならない => Must A N2
Needs, Requirements
かねない => (someone) might do something; something might happen N2
よりほかに...ない => to have no choice but ~ N2
Limit
にほかならない/からにほかならない => nothing but; none other than ~ N2
~かぎりなく ... にちかい => Almost, near, like, almost like N... N1
Limit, limit
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
に足りない/に足らない => cannot; not worthy; not worth doing ~ N1
~なりに/~なりの      => suitable; in one's own way / style N1
...なりなんなり... => any,anything,whatever N1
Vague
..... ばかりもいられない => can't keep doing ~ N2
Speculation