Simple past tense and past participle of slenderize.(verb)
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Use "slenderized" in a sentence
"Although I "slenderized," before hitting 15, I never could / would wear a bikini."
"Nintendo has further slenderized the DSi (by eliminating the slot for Nintendo Advance games, which the DS and DS Lite supported), and increased the size of the luminous screens."
"That's the newly slenderized me, toasting you in a photo taken last weekend at the WonderFest Reunion, an informal gathering of friends who enjoy each other's company, choice liquid refreshment, and the best sushi in the world."