IPA: //ʌnɪkˈsaɪtɪd//
KK: /ʌnɪkˈsaɪtɪd/
Not feeling or showing excitement; lacking enthusiasm or interest.
She felt unexcited about the upcoming event, as it seemed boring to her.
Unexcited → It is formed from "un-" (meaning not) and "excited" (from Latin "excitare", meaning to rouse or stir up). The word "unexcited" means not roused or stirred up, indicating a lack of excitement.
Think of 'not' ('un-') being added to 'roused' or 'stirred up' ('excited') — that's why unexcited means not feeling excited.