IPA: /ˌɪrɪˈzɒl.juːt.li/
KK: /ɪˈrɛzəˌluːtli/
In a way that shows uncertainty or indecision; not being able to make a choice or decision clearly.
She spoke irresolutely, unsure of what to say next.
Irresolutely → It is formed from "ir-" (meaning not) and "resolutus" (from Latin, meaning resolved or determined) and the suffix "-ly" (meaning in a manner). The word describes acting in a manner that is not resolved or determined, indicating indecision.
Think of someone who is 'not' ('ir-') 'resolved' ('resolutus') in their decisions, which helps you remember that 'irresolutely' means acting without determination.