[極「きわ」]み/[極「きわ」]まりない => Extremely A N1
Degree/ Level/Amount
[極「きわ」]まる => Extremely A, could not be more A N1
Adjectival, Descriptions
[要「よう」]するに => A. In short/put simply, B N2
Adjectival, Descriptions
[必要「ひつよう」]はない => It is not necessary for A to be done N2
Needs, Requirements