Wall assembly, wherein the wall or ceiling assembly comprises wall or ceiling panels, wherein these panels are coupled to each other at least at one pair of side edges of the panels by means of coupling parts providing a coupling of the panels and effecting a mechanical locking between these panels; wherein the wall or ceiling panels, comprise on one side edge of the panel a male coupling part and, on an opposite side edge of the panel , comprise a female coupling part , wherein the coupling parts (13-14) are configured such that two of such panels , by means of the coupling parts (13-14), can be coupled to each other in a plane and thus a coupled condition can be realized between the panels ; wherein the male coupling part comprises a tongue and the female coupling part comprises a groove , which tongue and groove , in the coupled condition, form a tongue and groove connection, which realizes a mechanical locking between the panels in the direction (D1) perpendicular to the plane of the panels ; wherein the groove is bordered by a front lip and a rear lip ; and wherein the coupling parts (13-14) each comprise a locking part (28-29), which locking parts (28-29), in the coupled condition, realize a mechanical locking between the panels in the direction (D1) in the plane of the panels and perpendicular to the side edges (9-10); wherein the locking part of the male coupling part is provided on the rear side of the tongue and the locking part of the female coupling part is provided on the front side of the rear lip ; wherein the rear lip , or at least a part thereof, can bend in rearward direction, even if the panels or the rear lip is secured to a flat substructure ; characterized in that the locking between these panels is also effected by an adherence agent or glue; wherein the portion of the rear lip which extends beyond the open or free end of the front lip is longer than the thickness of the panel. wherein the wall or ceiling panels, comprise on one side edge of the panel a male coupling part and, on an opposite side edge of the panel , comprise a female coupling part , wherein the coupling parts (13-14) are configured such that two of such panels , by means of the coupling parts (13-14), can be coupled to each other in a plane and thus a coupled condition can be realized between the panels ; wherein the male coupling part comprises a tongue and the female coupling part comprises a groove , which tongue and groove , in the coupled condition, form a tongue and groove connection, which realizes a mechanical locking between the panels in the direction (D1) perpendicular to the plane of the panels ; wherein the groove is bordered by a front lip and a rear lip ; and wherein the coupling parts (13-14) each comprise a locking part (28-29), which locking parts (28-29), in the coupled condition, realize a mechanical locking between the panels in the direction (D1) in the plane of the panels and perpendicular to the side edges (9-10); wherein the locking part of the male coupling part is provided on the rear side of the tongue and the locking part of the female coupling part is provided on the front side of the rear lip ; wherein the rear lip , or at least a part thereof, can bend in rearward direction, even if the panels or the rear lip is secured to a flat substructure ; characterized in that the locking between these panels is also effected by an adherence agent or glue; wherein the portion of the rear lip which extends beyond the open or free end of the front lip is longer than the thickness of the panel. <EOS>