A connectorized fiber optic cable assembly comprising: a connector housing comprising a ferrule retaining portion, an adapter seating portion, and a longitudinal axis extending through the ferrule retaining portion of the connector housing and the adapter seating portion of the connector housing, wherein the connector housing has a Young's modulus E H; a ferrule retained by the ferrule retaining portion of the connector housing, the ferrule comprising an optical fiber bore; a cable adapter comprising an optical cable passageway, an optical fiber passageway, an extension securement portion, a housing insert portion seated in the adapter seating portion of the connector housing, and an adapter abutment positioned between the extension securement portion and the housing insert portion, wherein the adapter abutment limits an extent to which the cable adapter extends into the adapter seating portion of the connector housing, wherein the cable adapter has a Young's modulus E A, which is less than the Young's modulus E H of the connector housing; an adapter extension secured to the extension securement portion of the cable adapter and comprising an extended cable passageway, wherein the adapter extension has a Young's modulus E E of between 80 MPa and 500 MPa, at room temperature, which is less than the Young's modulus E A of the cable adapter; a fiber optic cable extending along the extended cable passageway of the adapter extension and the optical cable passageway of the cable adapter, the fiber optic cable comprising an optical fiber extending along optical fiber passageway of the cable adapter to the optical fiber bore of the ferrule; and a multi-diametrical sealing flexure comprising a cable engaging portion engaging an outer cable surface of the fiber optic cable, a housing engaging portion engaging an outer housing surface of the connector housing, and an intermediate flexure portion extending from the cable engaging portion to the housing engaging portion and engaging an outer extension surface of the adapter extension, wherein the multi-diametrical sealing flexure has a Young's modulus E F of between 30 MPa and 80 MPa, at room temperature, which is less than the Young's modulus E E of the adapter extension. a connector housing comprising a ferrule retaining portion, an adapter seating portion, and a longitudinal axis extending through the ferrule retaining portion of the connector housing and the adapter seating portion of the connector housing, wherein the connector housing has a Young's modulus E H; a ferrule retained by the ferrule retaining portion of the connector housing, the ferrule comprising an optical fiber bore; a cable adapter comprising an optical cable passageway, an optical fiber passageway, an extension securement portion, a housing insert portion seated in the adapter seating portion of the connector housing, and an adapter abutment positioned between the extension securement portion and the housing insert portion, wherein the adapter abutment limits an extent to which the cable adapter extends into the adapter seating portion of the connector housing, wherein the cable adapter has a Young's modulus E A, which is less than the Young's modulus E H of the connector housing; an adapter extension secured to the extension securement portion of the cable adapter and comprising an extended cable passageway, wherein the adapter extension has a Young's modulus E E of between 80 MPa and 500 MPa, at room temperature, which is less than the Young's modulus E A of the cable adapter; a fiber optic cable extending along the extended cable passageway of the adapter extension and the optical cable passageway of the cable adapter, the fiber optic cable comprising an optical fiber extending along optical fiber passageway of the cable adapter to the optical fiber bore of the ferrule; and a multi-diametrical sealing flexure comprising a cable engaging portion engaging an outer cable surface of the fiber optic cable, a housing engaging portion engaging an outer housing surface of the connector housing, and an intermediate flexure portion extending from the cable engaging portion to the housing engaging portion and engaging an outer extension surface of the adapter extension, wherein the multi-diametrical sealing flexure has a Young's modulus E F of between 30 MPa and 80 MPa, at room temperature, which is less than the Young's modulus E E of the adapter extension.