直ただちに

すぐにN5sense 1
すぐに is the casual, everyday word for 'right away', while 直ちに is more formal and stresses that there is absolutely no delay.
即そく座ざにN1sense 1
即座に highlights an instant, on-the-spot reaction, whereas 直ちに is used more broadly for formal instructions or urgent necessity.
早さっ速そくN3sense 1
早速 conveys promptness or eagerness to act right away, while 直ちに is more neutral and formal, often in official or urgent contexts.
即そっ刻こくN1
直ちに and 即刻 are both formal words for 'immediately', but 即刻 carries a stronger sense of urgency or punitive decisiveness, often in commands or penalties.

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すぐN4
直ちに is more formal and emphatic than すぐ, typically used in official announcements or commands.
即そくN1
直ちに is the common formal adverb meaning 'at once' in everyday and official writing, whereas 即 rarely stands alone and appears mainly inside compound words such as 即死.
すぐさま
直ちに is formal and typical of official or written instructions, whereas すぐさま is neutral and common in everyday speech.
今いますぐ
直ちに is a formal, often written or official word for 'immediately', whereas 今すぐ is the everyday spoken equivalent.
即そく時じ
直ちに is a standard conversational adverb meaning 'at once', while 即時 is more formal and often appears inside compound nouns like 即時対応.
即そく座ざN1
直ちに is a formal adverb meaning 'immediately', often in written instructions or news, while 即座 more often describes a person's instant reaction in the moment.

Opposites

徐じょ々じょにN3sense 1
徐々に means 'gradually', the opposite of 直ちに's sense of immediate, zero-delay action.

直じきにN1
直に (じきに) means 'soon' or 'directly' and shares the same kanji root as 直ちに, but they are read and used differently, so learners often mix them up.

直ただちにUsage61%
Standard kanji spelling; high priority.
ただちにUsage39%
Kana spelling is common in everyday writing, especially when the kanji is not needed.

Compound of 直 (tada, 'direct') + ち (emphatic particle) + に (adverbial particle). The exact historical derivation of the particle ち is uncertain.