Simple past tense and past participle of staple. (verb)
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Use "stapled" in a sentence
"I'm a bit worried for his hair which I'm reliably informed is stapled ... as in stapled?"
"Lumber used for posts should be pressure-treated and rated for ground contact: The tag stapled to the product's end grain should read "End Use Ground Contact," and somewhere adjacent to that term will be "0.40 pcf," which designates the concentration of preservative used in these products."
"On another worksheet with a rubric stapled to it, my daughter did not miss anything, but was given the grade of an MP."