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I was trying to write a line like

The commandos got into the building without anyone knowing.

But I think that there's a single word for "without anyone knowing". Can anyone help me with this?

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"Secretly", or any synonym of that word, would work. –  Zibbobz Sep 27 '13 at 20:02
    
Anyone is one word. Just like someone and everyone, anybody and somebody, or really any pronoun for that matter. As to your question, you are asking for a verb in the title, but for an adverb in the body. Which one is it, now? –  RegDwigнt Sep 27 '13 at 20:37
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6 Answers 6

up vote 4 down vote accepted

You could say they snuck (or sneaked) into the building. You could say they entered stealthily or secretly or surreptitiously or furtively.

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"The commandos slipped into the building unnoticed."

Slip - [with adverbial of direction] go or move quietly or quickly, without attracting notice:

Usage: "We slipped out by a back door".

EDIT: I misread your question at first. I would use unnoticed, unseen, or undetected

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Perhaps infiltrated would suit your needs:

  1. a. To pass (troops, for example) surreptitiously into enemy-held territory.
    b. To penetrate with hostile intent: infiltrate enemy lines; terrorists that had infiltrated the country.
  2. To enter or take up positions in gradually or surreptitiously, as for purposes of espionage or takeover: infiltrated key government agencies with spies.
  3. To cause (a liquid, for example) to permeate a substance by passing through its interstices or pores.
  4. To permeate (a porous substance) with a liquid or gas.

—source TheFreeDictionary.com

For example:

The commandos infiltrated the building.

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Snakes are pretty sneaky so we can use snake terms like slithered or crept.

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In a conversational context, @Mr. Shiny and New's sneaked/snuck is probably the most likely verb, but it's a bit informal, and there's always the problem of which past tense form to use.

For a slightly more "literary/formal" alternative, I'd suggest...

They stole into the building.
steal (no object, with adverbial of direction): move somewhere quietly or surreptitiously.

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With Halloween in mind:

"The commandos ghosted into the building, unseen by mortal eye."

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