conspiratorial
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/kənˌspɪrəˈtɔːriəl/
🇬🇧
/kənˌspɪrəˈtɔːriəl/
Relating to or suggestive of a secret plan, often illegal.
He whispered in a conspiratorial tone, hinting at a secret plan.
Giving the impression that a secret is being shared.
She glanced around with a conspiratorial smile before revealing the surprise.