to conclude; to decide; to determine — to come to a firm conclusion or decide decisively.
専門家たちはこの技術は有望だと断じた。
The experts concluded that this technology is promising.
私はその案は実行に値しないと断じる。
I conclude that the proposal is not worth implementing.
彼は状況を検討して、それが最善の策だと断じた。
He examined the situation and determined it was the best course of action.
to judge — to evaluate or judge someone or something (reaching a verdict or appraisal).
世間は彼の行為を裏切りだと断じた。
Society judged his actions to be betrayal.
裁判官は被告を有罪だと断じた。
The judge judged the defendant to be guilty.
まだ証拠が不十分で、誰も最終的に断じることはできない。
The evidence is still insufficient; no one can judge definitively yet.