[極「きわ」]み/[極「きわ」]まりない => Extremely A N1
Degree/ Level/Amount
~からなる(成る)      => Consists of; formed to N2
~きわまる/きわまりない(~極まる/極まりない)      => extremely; very ~ N1
[極「きわ」]まる => Extremely A, could not be more A N1
Adjectival, Descriptions