Meaning: nearly noiseless (example 1, example 2)
Rewrite 1: quiet as a worm
Rewrite 2: silent as a spider
Rewrite 3: calamitous as a cotton ball
Rewrite 4: noisy as drying paint
Comment: Sometimes said as "still as a mouse," so you could also use that as another variation. Also note that in the third and fourth rewrites that I took an opposite tack.
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