IPA: /ˈæsɪdi/
KK: /ˈæsɪdi/
Having a taste or quality similar to that of an acid; somewhat sour or sharp.
The lemon had an acidy taste that made my mouth pucker.
Comparative: more acidy
Superlative: most acidy
Acidy is formed from "acid" (from Latin "acidus", meaning sour or sharp) and the suffix "-y" (meaning characterized by). The word "acidy" describes something that is characterized by a sour or sharp taste.
Think of the word 'acid' which means sour, and remember that 'acidy' describes something that has that sour characteristic.