A thrust reverser for a nacelle of an aircraft turbojet engine comprising at least: - a thrust reverser cowl movable in translation along a direction substantially parallel to a longitudinal axis of the nacelle, between a direct jet position and a reversed jet position, - an outlet nozzle of variable section which is arranged in the downstream extension of said cowl and which is movable between at least one reduced ejection section position, one increased ejection section position and one intermediate neutral position, and - at least one actuator which comprises a body mounted on a fixed structure of the thrust reverser and an actuator rod, said rod being adapted to drive in displacement the variable nozzle and the movable cowl, said thrust reverser being characterized in that it comprises a passive coupler including: - a hollow casing secured to the thrust reverser cowl, and which internally delimits a cavity axially extending globally along the axis of the actuator rod and which is radially delimited by a radial upstream wall and by a radial downstream wall; - a piston fastened on the actuator rod of the actuator and which is slidably mounted in the casing of the coupler by dividing hermetically said cavity into two compartments comprising an upstream compartment located between the upstream wall and the piston and a downstream compartment located between the downstream wall and the piston, each compartment (44; 46) being filled with a fluid; and - a unidirectional flow rate limiter ensuring the fluid connection between the two compartments (44, 46) of the casing, said flow rate limiter limiting the circulation flow rate of the fluid in the direction of a fluid flow from the downstream compartment toward the upstream compartment, and allowing a free circulation of the fluid in the direction of a fluid flow from the upstream compartment toward the downstream compartment. - a thrust reverser cowl movable in translation along a direction substantially parallel to a longitudinal axis of the nacelle, between a direct jet position and a reversed jet position, - an outlet nozzle of variable section which is arranged in the downstream extension of said cowl and which is movable between at least one reduced ejection section position, one increased ejection section position and one intermediate neutral position, and - at least one actuator which comprises a body mounted on a fixed structure of the thrust reverser and an actuator rod, said rod being adapted to drive in displacement the variable nozzle and the movable cowl, - a hollow casing secured to the thrust reverser cowl, and which internally delimits a cavity axially extending globally along the axis of the actuator rod and which is radially delimited by a radial upstream wall and by a radial downstream wall; - a piston fastened on the actuator rod of the actuator and which is slidably mounted in the casing of the coupler by dividing hermetically said cavity into two compartments comprising an upstream compartment located between the upstream wall and the piston and a downstream compartment located between the downstream wall and the piston, each compartment (44; 46) being filled with a fluid; and - a unidirectional flow rate limiter ensuring the fluid connection between the two compartments (44, 46) of the casing, said flow rate limiter limiting the circulation flow rate of the fluid in the direction of a fluid flow from the downstream compartment toward the upstream compartment, and allowing a free circulation of the fluid in the direction of a fluid flow from the upstream compartment toward the downstream compartment.