Absolutely
Without Fail, Unconditionally
adverb
Extinction will happen as you go versus extinction. It will happen absolutely. It will happen without fail. There's nothing you can do to stop extinction.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Be careful though, 絶 is normally read as ぜつ, but in this case it is shortened to ぜっ.
絶対にワニカニレベル６０を達成してみせる！
I will definitely achieve WaniKani Level 60!
いやいや、絶対無理でしょ。
No way, that's absolutely impossible.
そんなことないよ、君なら絶対大丈夫だよ！
That's not true! You can definitely do it, I believe in you!
学校のある夜は、外出できないって言ってるでしょ。ダメだと言ったら絶対にダメだからね！
You can’t go out on a school night. If I say it’s no good, it’s absolutely no good!