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Kyler Murray's height won't keep him from reaching NFL greatness ... so says the shortest NBA player EVER -- Muggsy Bogues!!!

The Arizona Cardinals' #1 overall draft pick's height -- listed at 5'10" -- has been the center of criticism since Murray declared for the draft ... with some saying he'll struggle as an NFL QB.

Enter 5'3" Bogues -- who played 14 years in the NBA, despite having his fair share of doubters -- who says those critics will be eating their words ... 'cause Murray is a stud!!

"Kyler Murray is an unbelievable athlete," Bogues says. "Anybody that's undervaluing his size and underestimating his talent, they're in for a rude awakening when the season comes."