に足る => worthy; worth doing N1
に足りない/に足らない => cannot; not worthy; not worth doing ~ N1
…すぎ ... => too much N4
Emphasis on degree
すぎる => too much N4
かぎり/ないかぎり => While A is the case/still true N2
Conditional, While
かぎりだ => Very A N1
Degree/ Level/Amount
に[限「かぎ」]って/に[限「かぎ」]り => Only A (A is a special condition) N2
(Not)only, (Not) even
に過ぎない => no more than; just; merely; only ~ N2
に[限「かぎ」]る => A is the best N2
Information, Report
~ ないともかぎらない => ~ It's unlikely... won't N1
Speculation
~かぎり => as long as; while… is the case; as far as; while ~ N2
Emphasis on degree
にすぎない => Only A; No more than A N2
(Not)only, (Not) even