歴然|れきぜんrekizen[0]heiban (flat)

1. taru-adjective, adverb (with と)evident; plain; distinct; clear
   君きみが注意ちゅういを払はらっていなかったのは歴然れきぜんとしている。↗

   It's quite plain that you haven't been paying attention.

• Synonym明白めいはくNeutralEvidence that is clear and beyond doubt, as in 「明白な事実」; stresses clarity as a matter of reason, while 「歴然」 stresses a gap obvious at a glance.
• Related現然げんぜんWrittenClearly visible, plainly evident; written/formal prose, and not often used.
• Related見るからにNeutralAdverb for what you can tell at a glance, as in 「見るからに怪しい」; colloquial, and focused on outward appearance.
• Antonym曖昧あいまいNeutralAntonym: vague and equivocal, unclear; stands opposite the crystal-clear 「歴然」.
• Antonym不明瞭ふめいりょうNeutralAntonym: unclear and indistinct; the opposite of something evident at a glance.

Use 「歴然」 for gaps or evidence obvious at a glance, as in 「差は歴然としている」「歴然たる証拠」. For a matter clear in principle, say 「明白」; for what you can tell at a glance, 「見るからに」. The antonym is 「曖昧」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 明白めいはくなさま。