SLY Meaning of SLY in English sly, Sly BrE AmE slaɪ▷ slier, slyer ˈsla ɪ ‿ə AmE \ ˈslaɪ‿ ə r▷ sliest, slyest ˈslaɪ ɪst -əst Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012