IPA: /ˌɪnɪkˈspɪərɪnt/
KK: /ɪnɪkˈspɪrɪnst/
Not having much experience; lacking skills or knowledge in a particular area.
The inexperienced driver struggled to navigate the busy streets.
Inexperienced → It is formed from "in-" (meaning not) and "experienced" (from Latin "experientia", meaning knowledge gained through experience). The word "inexperienced" means lacking knowledge or skill due to not having experience.
Think of 'not' ('in-') having 'knowledge gained through experience' — that's why inexperienced means lacking experience.