IPA: /ˈstʌd.ɪd/
KK: /ˈstʌdɪd/
Carefully thought out or planned, often lacking spontaneity; showing knowledge or learning.
Her studied approach to the project impressed everyone in the meeting.
Comparative: more studied
Superlative: most studied
Studied → It is formed from "study" (from Latin *studium*, meaning zeal or application) and the suffix "-ed" (indicating a completed action). The word "studied" means having applied oneself to learning or having engaged in study.
Think of the word 'study' which means to apply oneself to learning, and remember that 'studied' indicates that this action has been completed.