IPA: /ɪnˈɔːrdɪnətli/
KK: /ɪnˈɔrdɪnətli/
In a way that is excessive or beyond what is reasonable.
She was inordinately excited about the surprise party.
Inordinately → It is formed from "in-" (meaning not) and "ordinatus" (from Latin, meaning arranged or ordered) and the suffix "-ly" (meaning in a manner). The word describes something that is not arranged or ordered, hence excessive or beyond normal limits.
Think of something that is 'not arranged' ('in-') in a 'normal' way ('ordinatus'), which helps you remember that 'inordinately' means excessively or beyond what is usual.