"stillest" in the adjective sense
1. inactive, motionless, static, still
not in physical motion
"the inertia of an object at rest"
2. silent, soundless, still
marked by absence of sound
"a silent house"
"soundless footsteps on the grass"
"the night was still"
3. placid, quiet, still, tranquil, smooth, unruffled
of a body of water) free from disturbance by heavy waves
"a ribbon of sand between the angry sea and the placid bay"
"the quiet waters of a lagoon"
"a lake of tranquil blue water reflecting a tranquil blue sky"
"a smooth channel crossing"
"scarcely a ripple on the still water"
used of pictures of a single or static photograph not presented so as to create the illusion of motion or representing objects not capable of motion
"a still photograph"
"Cezanne's still life of apples"
5. still, noneffervescent
"a still wine"
"still mineral water"
free from noticeable current
"a still pond"
"still waters run deep"
Source: WordNet® (An amazing lexical database of English)
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