IPA: /ɪkˈstrimər/
KK: /ɪkˈstrimər/
This word describes something that is at the highest or most intense level of a quality or condition, often used to indicate a greater degree than usual.
The weather conditions were even extremer than last year, causing more challenges for the hikers.
Extremer is formed from "extremus" (meaning outermost or farthest) and the comparative suffix "-er" (indicating a higher degree). The word "extremer" refers to something that is more extreme or at a greater degree of extremity than something else.
Think of 'extremus' meaning the 'outermost' or 'farthest' — so when you say 'extremer', you're talking about something that is at a greater degree of being farthest or most extreme.