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The superlative form of the word quiet is quieter
A digital clock is the quietest.
It's a famous military submarine...
Turtle
The quietest in the group are all of them.
David Bushnell .
Navy
The superlative form of "quiet" is "quietest."
quietest, quieter
Submarines are used both for military and rersearch purposes.
That is David Bushnell's 'Turtle'
Civilian-Under water research. Military-Stealth