Simple past tense and past participle of unescape. (verb)
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Use "unescaped" in a sentence
"I don't declare file encodings as they're always ASCII I don't put unescaped Unicode characters directly into my source files."
"So we should lobby the application developers to automatically validate the RSS feed every single time it is generated and automatically fix the most common errors (unescaped ampersands)."
"The nawab (Siraj-ud-Daulah) of the Bengal region captured Calcutta (June 20) and imprisoned unescaped residents in a small storeroom in the fort (later called the Black Hole), where over a hundred perished from suffocation, wounds, and the heat."