I'm fast asleep, I'm secure and unhurt.
The argument's valid, I firmly assert.
A body of water, a deafening alert,
a tool used by doctors, I'm found in concerts.

What am I?

  • Loved this one! – Bahrom Aug 20 at 15:38
up vote 27 down vote accepted

You are

Sound

I'm fast asleep, I'm secure and unhurt.

Sound asleep, Safe and sound.

The argument's valid, I firmly assert.

A sound argument in logic - An argument is sound if and only if it is valid and all its premises are true.

A body of water, a deafening alert,

A sound - a large sea or ocean inlet larger than a bay, deeper than a bight, and wider than a fjord, an alarm sound

a tool used by doctors, I'm found in concerts.

Ultrasound, Sound/ Stereo system in concerts.

  • 1
    Exceptional. The body of water thing really threw me off. Bravo Q&A. +1 +1 – Brent Hackers Aug 20 at 8:30

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