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con‧spi‧ra‧to‧ri‧al

1 a conspiratorial expression, voice, or manner suggests you are sharing a secret with someone :
His voice became low and conspiratorial.
Pat whispered to Maggie in a conspiratorial tone.
His voice became low and conspiratorial.
Pat whispered to Maggie in a conspiratorial tone.2 relating to a conspiracy
—conspiratorially adverb
