"quietest" in the adjective sense
1. quiet
characterized by an absence or near absence of agitation or activity
"a quiet life"
"a quiet throng of onlookers"
"quiet peace-loving people"
"the factions remained quiet for almost 10 years"
2. quiet
free of noise or uproar or making little if any sound
"a quiet audience at the concert"
"the room was dark and quiet"
3. quiet, restrained
not showy or obtrusive
"clothes in quiet good taste"
4. hushed, muted, subdued, quiet
in a softened tone
"hushed voices"
"muted trumpets"
"a subdued whisper"
"a quiet reprimand"
5. 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"
"unruffled water"
6. quiet
of the sun) characterized by a low level of surface phenomena, such as sunspots
Source: WordNet® (An amazing lexical database of English)
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