IPA: /ɪnˈɛkspɜːtnəs/
KK: /ɪnˈɛkspɜrtnəs/
The state of not having enough skill or knowledge in a particular area.
Her inexpertness in the subject was evident during the presentation.
Inexpertness is formed from "in-" (meaning not) and "expert" (from Latin "expertus", meaning experienced or skilled) and the suffix "-ness" (meaning the state of being). The word describes the state of not being skilled or lacking expertise.
Think of 'not' ('in-') being skilled or experienced ('expert') — that's what inexpertness means.