If I had to take a guess I'd have to say Cleveland Browns.
THEE INDIANAPOLIS Colts
Dallas Cowboys - 1975-1983
The Detroit Lions, Followed by an unexpected team, the Dallas Cowboys.
which NFL team beat the Miami Dolphins in the 1999 playoff game
The Dallas Cowboys but this was back in the 1970's so idk now
The Lions in 2008 and early 2009. 19 game losing streak.
The team's playoff record is 33-25.
As of the 2008 season, the only NFL team that has never won a playoff game is the Houston Texans.
denver broncos... XD
If you are talking about the NFL, NHL, NBA and MLB then the answer is the Chicago Cubs who have not won a championship since 1908.There are a number of teams that have never won a championship, but the Cubs 101 years without a title is the longest drought.Coincidentally, MLB has been around the longest.Longest championship drought in NBA: Sacramento Kings(1951, when the team was the Rochester Royals)Longest championship drought in NHL: Chicago Blackhawks(1960-1961)Longest championship drought in NFL: Arizona Cardinals(1947, then located in Chicago)
Houston Texans: 2
The Indianapolis Colts