Is “Shiftiest” a Scrabble word?
Yes
SHIFTIEST
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Shiftiest
adjective
1.Subject to frequent changes in direction.
2.(of a person's eyes) Moving from one object to another, not looking directly and steadily at the person with whom one is speaking.
3.Having the appearance of being dishonest, criminal or unreliable.
“He was a shifty character in a seedy bar, and I checked my wallet was still there after talking to him.”