He played college football as a wide receiver at Florida before signing with the Washington Redskins as an undrafted free agent in 2015, where he converted to cornerback.

[6][7] Dunbar entered training camp as a backup wide receiver and special teams' player, competing for a roster spot.

[9] On September 5, Dunbar was waived as part of the team's final roster cuts, but was signed to their practice squad the following day.

[12] Head coach Jay Gruden named Dunbar the fifth cornerback on the depth chart, behind DeAngelo Hall, Chris Culliver, Bashaud Breeland, and Will Blackmon.

[14] On November 29, Dunbar recorded two solo tackles, deflected two passes, and made his first career interception during a 20–14 victory against the New York Giants in Week 12.

He made his first career interception off a pass by Giants' quarterback Eli Manning in the end zone, but exited the game shortly thereafter due to a dislocated finger.

[16] Throughout training camp, Dunbar competed to be the third cornerback on the Redskins' depth chart against Dashaun Phillips and rookie Kendall Fuller.

[18] Head coach Jay Gruden named Dunbar the third cornerback on the depth chart to start the regular season, behind starters Josh Norman and Bashaud Breeland.

[22][23] Dunbar finished the 2016 NFL season with 26 combined tackles (23 solo), five pass deflections, one interception, and a sack in 14 games and two starts.

[26] Head coach Jay Gruden named Dunbar the third cornerback on the depth chart to start the season, behind starters Josh Norman and Bashaud Breeland.

[7][30][31] Dunbar entered training camp slated as a starting cornerback after Bashaud Breeland departed in free agency and Kendall Fuller was traded to the Kansas City Chiefs.

[33] Head coach Jay Gruden named Dunbar and Josh Norman the starting cornerbacks to begin the regular season in 2018.

[42] In Week 2 against the New England Patriots on Sunday Night Football, Dunbar recorded his first interception as a Seahawk off a pass thrown by Cam Newton during the 35–30 win.

[54] On May 14, 2020, an arrest warrant was issued by the Miramar Police Department, alleging Dunbar committed armed robbery alongside New York Giants cornerback Deandre Baker at a party the day before.

[61] Broward State Attorney Mike Satz announced Baker was charged with 4 counts of robbery with a firearm, and he was facing 10 years to life in prison if convicted.

Despite the fact that the witnesses by their own testimony appear to be paid off, the state attorney case filer, Alex Urella, still filed against Baker.