shady

Any place that's protected from the glare and heat of the sun is shady, as in a "shady nook." But as its darkened nature implies, shady has the equally popular meaning of "suspicious, dangerous, or deceitful." A "shady character" is up to no good.

The metaphorical meaning of shady has long been embraced by slang. Since at least the 1950's, the phrase "got it made in the shade" means having a great and easy life or job (picture eastern sultans being shaded by servants holding giant leaves). The rap sultan Eminem calls his evil alter-ego "Slim Shady," conjuring up a devilish suggestion of the Prince of Darkness himself — someone who definitely lives in a shady neighborhood.

Definitions of shady
1

adj filled with shade

“the shady side of the street”
Synonyms:
shadowed, shadowy, umbrageous
shaded
protected from heat and light with shade or shadow

adj not as expected

“a shady deal”
Synonyms:
fishy, funny, suspect, suspicious
questionable
subject to question

adj of questionable taste or morality

Synonyms:
louche
disreputable
lacking respectability in character or behavior or appearance

adj (of businesses and businessmen) unscrupulous

“a shady operation”
Synonyms:
fly-by-night
untrustworthy, untrusty
not worthy of trust or belief

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