IPA: /ˌʌn.səˈfɪs.tɪ.keɪ.tɪd/
KK: /ʌnˌsəˈfɪstɪˌkeɪtɪd/
Not having a lot of experience or knowledge about the world; simple and straightforward.
Her unsophisticated approach to the problem surprised everyone.
Unsophisticated → It is formed from "un-" (meaning not) and "sophisticated" (from Latin "sophisticare", meaning to make wise or to refine). The word "unsophisticated" means not refined or lacking in sophistication or complexity.
Think of 'not' ('un-') being added to 'refined' or 'wise' ('sophisticated') — this helps you remember that unsophisticated means lacking refinement or complexity.