Simple past tense and past participle of unseam.(verb)
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Use "unseamed" in a sentence
"And Clyde noted how one pocket on her dress drooped just a bit, becoming unseamed."
""Calm down now, " Jack said as he unseamed the man's brown robe with a Ka-Bar knife, then freed the Velcro straps of his bulletproof vest with a loud rip."
"He inserted a finger in the catch and slowly unseamed her tunic."