にたえる/にたえない => Can't do A, can't stand/tolerate A, Can do A, N1
Potential, Possibility
~にたえる (耐える)    => bear doing ~ N1
にこたえ(て) => in response to ~ N2
いかに … とはいえ => What ever... N3
Things do not match the prediction
に堪えない => not worth doing; can't do; cannot bear doing ~ N1
めったにない => Rarely N3
Degree. Level, Amount
めったに~ない => hardly; rarely; seldom N3
に[答「こた」]えて => In response to A N2
Reason, Result, Response
さえ/にさえ/でさえ => Even N3
Not only, Not even
... おぼえはない => don't remember... N3
Position, perspective
の[末「すえ」]/た[末「すえ」] => conclusion N2
Reason, Result, Response
さえ...たら => Just...is enough N3
Conditions (sufficient conditions)