-IEST Meaning of -IEST in English -iest superlative of▷ -y i‿ɪst əst ▷ — dirtiest ˈdɜːt i‿ɪst əst AmE \ ˈdɝːt̬ i‿əst Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012