Free from agitation or disturbance; quiet, still, tranquil, serene; without wind, not stormy. spec. Absolutely without wind.

Free from wind; not exposed to or stirred by the wind, in or upon which no wind blows.

Not exposed to or disturbed by the wind; very still (now usually oppressively so); unstirred by the slightest breeze.

Breezeless, still.

Without a breeze; still, calm.

Not breathing or respiring; esp. holding the breath; breathless.

†(a) (in quot. 1821, of wind) characterized by the absence of mild or gentle currents; (hence) strong, violent (obsolete); (b) breezeless; calm…

Of water, air, etc.: Without motion or current; still, standing. (See also dead water, n.)