Geathers played his entire professional career for the Bengals and became a regular starter a defensive end in 2005, his second season in the NFL.

[4] He had a career game resulting in a victory on Nov 7 against the Dallas Cowboys with a sack, forced fumble, pass defended, and QB pressure that led to an intentional grounding penalty.

[4] On January 2, 2005, against the Philadelphia Eagles, he intercepted a pass by Jeff Blake and returned it 36 yards for his first career NFL touchdown; that score and extra point put the Bengals up 24–3.

[11] In the November 6 win over the Baltimore Ravens, Geathers, Anthony Mitchell, and John Thornton combined for 3 sacks.

[12] On December 10, Geathers and rookie Odell Thurman combined for a sack of Charlie Frye in the Bengals' 23–20 win over in-state rival Cleveland Browns.

Coach Marvin Lewis maintained that Eddie Kennison might have tried to block Geathers forcing him into Green.

[19] Geathers was the Bengals' top sacker with 3.5 sacks in 2007 and also had 47 tackles, 3 passes deflected, 1 interception, and 1 forced fumble.

[11] On November 16, in a tied game against the Philadelphia Eagles, Geathers sacked Donovan McNabb and forced a fumble recovered by Cincinnati; the ensuing drive led to a Shayne Graham field goal.

[4][21] In 2009, Geathers led the Bengals in tackles with 36 and made 3.5 sacks, 3 passes deflected, and 1 forced fumble.

[4] Geathers had another fumble recovery on November 21 against the Oakland Raiders and returned the ball 38 yards; the ensuing Bengals drive led to a field goal.

[23] On September 26, 2010, Geathers's recovery of a Jonathan Stewart fumble and return to the Carolina Panthers' 37-yard line set up a game-clinching touchdown drive for the Bengals.

[24] Geathers finished 2010 playing and starting in all 16 games, with 33 tackles, 1 sack, 2 passes deflected, and 1 forced fumble.