Simple past tense and past participle of unhide.(verb)
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Use "unhidden" in a sentence
"While being the most emotionally draining film of the year, Shame was also the most explicit and it's continuously unhidden sex scenes that served the film its realism was most likely, and regrettably, too risky for the Academy."
"Then when things change, the bad habits of the organization, which were compensated for with excess spending and often excess hiring, now surface unhidden, result in severe changes or layoffs, and are harder to fix because they're well, habits."
"Those statements reflect an unhidden agenda in the Democratic party that perpetuates the continued poverty of millions of blacks."