っこない => A is definitely not possible N2
Potential, Possibility
ことになっている => Plan, rule, decide N2
Information, Report
て[以来「いらい」] => After A, B (continuous action/condition N2
Information, Report
ことはない => Not necessary N3
Needs, Requirement
めったにない => Rarely N3
Degree. Level, Amount
ところだった => About to… N3
Will, Decision, Doing
といったらない/といったらありはしない => Extremely A, Very A, A beyond description N1
Degree/ Level/Amount
[決「けっ」]して~ない => Won’t, isn’t N3
Will, Decision, Doing
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
どころではない => Its not A N2
Contrast,Surprise
といったところだ => Display an amount/level/degree A (程度) N1
Degree/ Level/Amount
ないことはない => There is a (small) possibility of A. A is not impossible. N3
Potential, Possibility