Difference between Questionable and Shady

QUESTIONABLE vs SHADY: ADJECTIVE

Of dubious respectability or morality
Problematic; open to doubt or challenge
Liable to question; subject to be doubted or called in question; problematical; doubtful; suspicious.
Admitting of being questioned; inviting, or seeming to invite, inquiry.
Of dubious morality or respectability.
Not yet determined or specified.
Open to doubt or challenge; problematic.
Subject to question
Able to be refuted

Of businesses and businessmen
Filled with shade
Of questionable taste or morality
Not as expected
Full of shade; shaded: : dark.
Casting shade.
Of dubious character, morality, or legality; questionable.
Abounding in shade or shades; overspread with shade; causing shade.
Sheltered from the glare of light or sultry heat.
Of or pertaining to shade or darkness
On the thither side of; as, on the shady side of fifty; that is, more than fifty.
To stay in concealment; also, to be reticent.
Abounding in shades.
Causing shade.
Not trustworthy; Unfit to be seen or known.
(of businesses and businessmen) unscrupulous

Capable of being questioned or inquired of; inviting or seeming to invite inquiry or conversation.
Liable to question; suspicious; doubtful; uncertain; disputable: as, the deed is of questionable authority; his veracity is questionable.

Of questionable honesty or legality
Quiet, dark, or concealed
Abounding with or affording shade.
Sheltered from glare or sultry heat; shaded: as, a shady place.
Such as cannot bear the light; of doubtful honesty or morality: as, a shady transaction.

Supposed, Apocryphal, Deniable, Suspect, Refutable, Alleged, Equivocal, Suspicious, Fishy, Problematical, Shady, Problematic, Debatable, Doubtful, Dubious

Untrusty, Umbrageous, Fly by night, Queer, Suspect, Shadowed, Funny, Suspicious, Louche, Shaded, Fishy, Untrustworthy, Questionable, Shadowy, Disreputable

Supposed, Apocryphal, Deniable, Suspect, Refutable, Alleged, Equivocal, Suspicious, Fishy, Problematical, Shady, Problematic, Debatable, Doubtful, Dubious

Untrusty, Umbrageous, Fly by night, Queer, Suspect, Shadowed, Funny, Suspicious, Louche, Shaded, Fishy, Untrustworthy, Questionable, Shadowy, Disreputable

Histopathology should be considered to discern questionable lesions.
Implement procedures for follow up on questionable cases.
Any questionable purchases are reimbursed by the employees.
The value of determining rectal temperature is questionable.
Report: Steph Curry, Kevin Durant questionable tomorrow vs.
Might some of those restrictions be constitutionally questionable?
The evidence behind this dietary strategy is questionable.
Propose removing this verbiage as it is questionable whether this is relevant given the amount of information available and possibly ethically questionable.
Do report coupons you see that look questionable by sending any valuable information you have about where you saw or received a questionable coupon.
We have software on all our electronics that alerts each other if we go to questionable sites or search questionable content, etc.

Lady Mary Gets Shady on 'Downton Abbey' - FashionistaLady Mary Gets Shady on 'Downton Abbey'.
Near the end of the Shady Grove exit ramp, before you get to Shady Grove Rd, make a right onto Redland Blvd.
Shady avenue, for the Shady Avenue Presbyterian Congregation.
The Shady Canyon Trail is an incredibly scenic route along Shady Canyon Drive in southern Irvine.
Shady Grove students may become eligible upon paying an activity fee at the Shady Grove campus.
Judy grew up in the Shady Grove community of Timpson and attended Shady Grove Methodist Church.
She is shady, and Paul Hollywood is a little shady, too.
This is unacceptable, and indicitive of a shady company employing shady business practices.
Its shady, but then, Gulf State Toyota is a shady outfit.
It truly is a shady place for shady people.