絶対に|ぜったいにzettaini[0]heiban (flat)

1. adverbabsolutely; definitely; unconditionally
   この事ことは絶対ぜったいに口外こうがいしません。↗

   I'll never tell this to anyone.

• Synonym決してけっしてNeutralNot a true antonym: in modern usage it usually takes a negative and means 'never', close to 「絶対に～ない」; 「絶対に」 works with both affirmative and negative.
• SynonymまったくNeutralMeans 'completely, truly' and can also stand alone as the exclamation 「まったく！」; unlike 「絶対に」, it does not specifically express determination.
• Synonym断然だんぜんNeutralResolute and decisive, or by far ahead of the rest, as in 「断然有利」.
• Synonym断じてだんじてNeutralHard and emphatic in tone: with a negative it means 'never', as in 「断じて許さない」, and with an affirmative it declares firm resolve, as in 「断じて勝つ」.
• Related誓ってちかってNeutralCarries the nuance of swearing or guaranteeing, as in 「誓って嘘ではない」; the focus is on the oath itself.
• RelatedまるっきしCasualColloquial; it means 'completely', or with a negative 'not at all', as in 「まるっきし分からない」.
• Related神掛けてかみかけてWrittenBelongs to written/formal prose and is old-fashioned; used to swear by God, as in 「神かけて誓う」.

For 'absolutely' or 'definitely', use 「絶対に」, as in 「絶対に行く」 and 「絶対に忘れない」. To stress 'never', 「決して」 is the usual choice and normally takes a negative; for a harder, more emphatic tone, use 「断じて」.

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

1. どのような条件じょうけんや状況じょうきょうでも、例外れいがいなく必かならずそうなる、またはそうする、という強つよい確実かくじつさを表あらわす。