1) Quietly persuasive 2) Relaxed 3) Sales technique 1) Quietly persuasive 2) Subtle 3) Without vigor or persistence 
• (a.) Having, employing, or exerting, a low degree of pressure.
A mass of air that presses down only weakly on the surface of the Earth because it is being warmed and it therefore less dense
Low'-pres`sure adjective Having, employing, or exerting, a low degree of pressure. Low-pressure steam engine , 
An area of atmospheric pressure within the Earth's atmosphere that is below average. If this system is on the Earth's surface and contains circular wind flow and enclosed isobars it is called a cyclone.
[adj] - not forceful
adjective not forceful; `a low-pressure salesman`; `a low-pressure campaign`
having or involving a low or below-normal pressure, as steam or water. · without vigor or persistence; not forceful or aggressive: a low-pressure campaign. · quietly persuasive; subtle; indirect: a low-pressure salesman.