Very, extremely.
"What, you don't like your food?" Russo asks. ¶ "Are you kidding? It's dumb good."
Alternative form of D.U.M.B. (deep underground military base
From Middle English dumb (“silent, speechless, mute, ineffectual”), from Old English dumb (“silent, speechless, mute, unable to speak”), from Proto-West Germanic *dumb, from Proto-Germanic *dumbaz (“d...
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An intensifier expressing contempt; damn, damned.
Pap came to stand beside her and watched the two play. "That pup has just plum' fell in love with our Sammy, an' Sam's real took by him," Pap said. "It's a dumb shame, too. I talked to Jim, but he's not of a mind to sell."
An acronym for remembering desirable characteristics for goal-setting: dream-driven, uplifting, method-driven, behavior-driven.
Whatever your goals, starting with a DUMB goal gives a great outline and starting off point to start building your plan of action.
To make stupid.
I think she's dumbing us down, so we won't be smarter than her.
To represent as stupid.
Bad-mouthing Neanderthals […] is symptomatic of a need to exclude and even demonize. […] I suggest that the unproven dumbing of the Neanderthals is an example of the same cultural preconception.