quiet<sup>2sup> [quieter -comp., quietest -sup.]
(adj.) = tranquilo, sosegado, calmado, callado
Ex: Properly read, live literature -- even the quietest or most light-hearted -- may be disturbing, may subvert our view of life.
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* as quiet as a mouse = sigilosamente, con sigilo, sin apenas ser oído, sin hacer ruido, sin decir ni mú, sin decir ni pío
* go + quiet = callarse