This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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ad. At depth, in a deep way.

ad. To a deep extent.

ad. profoundly

ad. At or to a great depth; far below the surface.

ad. Profoundly; thoroughly; not superficially; in a high degree; intensely.

ad. Very; with a tendency to darkness of color.

ad. Gravely; with low or deep tone.

ad. With profound skill; with art or intricacy.

At or to a great depth; far below the surface.

Profoundly; thoroughly; to a great degree: as, he was deeply versed in ethics.

Intensely.

With strong feeling, passion, or appetite; eagerly; immoderately; passionately.

With profound sorrow; with deep feeling.

With low or deep pitch: as, a deeply toned instrument.

With elaborate artifice; with deep purpose: as, a deeply laid plot or intrigue.

ad. to a great depth;far down

ad. to a great depth psychologically

"In other words breathe deeply, and _control deeply_, but with the whole body -- from below, not with the upper chest only, or with lateral expansion only, or abdominal expansion only."

deeper   

profoundly    thoroughly    intensely    very    gravely   

cheaply    steeply