• 否定ひてい — denial; negation
• 賛否さんぴ — approval and disapproval
• 安否あんぴ — safety; welfare
• 否認ひにん — denial; repudiation
• 可否かひ — pros and cons; advisability
• 拒否きょひ — refusal; rejection

否 combines 口 (mouth) with 不 (not), conveying the act of verbally rejecting or refusing. It represents disagreement or negation in spoken form.

The kun-yomi “いな” is an old-fashioned way of saying “no,” mostly replaced today by “いいえ.”

彼かれは 提案ていあんを 拒否きょひした。
He rejected the proposal.

安否あんぴが 不明ふめいです。
We don’t know if they’re safe.