conspiratorial

adjective
1
connected with, or making you think of, a conspiracy(= a secret plan to do something illegal)
توطئه‌آمیز, مرتبط با توطئه
2
suggesting that a secret is being shared
توطئه‌آمیز, رازگونه, سرّی
‘I know you understand,’ he said and gave a conspiratorial wink.
Everything he said seemed conspiratorial.
Her voice dropped to a conspiratorial whisper.