• 絶対ぜったい — absolutely
• 絶望ぜつぼう — despair
• 絶交ぜっこう — breaking off relations
• 絶滅ぜつめつ — extinction
• 中絶ちゅうぜつ — abortion / interruption

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絶 combines the thread radical 糸 with 色, giving the idea of cutting something off. It conveys the end of a connection — whether relationships, hope, or existence itself.

希望きぼうを 絶たってはいけません。
Don't lose hope.

二人ふたりは 絶交ぜっこうしたそうです。
It seems they ended their friendship.