IPA: /ˌɪnədˈmɪsəblɪ/
KK: /ɪnədˈmɪsəblɪ/
In a manner that is not allowed or accepted, often referring to rules or standards.
The evidence was presented inadmissibly in court, leading to its rejection.
Inadmissibly → It is formed from "in-" (meaning not) and "admissible" (from Latin "admittere", meaning to allow or send to). The suffix "-ly" (meaning in a manner) indicates the manner of being not allowed or accepted. Thus, "inadmissibly" means in a manner that is not allowed or accepted.
Think of 'not' ('in-') allowing something ('admittere') — that's why inadmissibly means something is not allowed.