low-pressure

[loh-presh-er]
adjective
1.
having or involving a low or below-normal pressure, as steam or water.
2.
without vigor or persistence; not forceful or aggressive: a low-pressure campaign.
3.
quietly persuasive; subtle; indirect: a low-pressure salesman.

Origin:
1820–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
low-pressure
 
adj
1.  having, using, or involving a pressure below normal: a low-pressure gas
2.  relaxed or calm

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Wind is the movement of air from an area of high pressure to an area of low
  pressure.
The low pressure sucks water in, carrying the animal along with it.
At low pressure and temperature, nitrogen forms molecular crystals and becomes
  an electric insulator.
The warmed air rises rapidly, in the process creating low pressure at the water
  surface.
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