IPA: /ʌnˈɡɑːrdɪdli/
KK: /ʌnˈɡɑrdɪdli/
In a way that is open and honest, without any defenses or protection.
She spoke unguardedly about her feelings during the meeting.
Unguardedly → It is formed from "un-" (meaning not), "guarded" (from Old French *guarder*, meaning to protect or keep safe), and "-ly" (meaning in a manner of). The word describes an action done in a manner that is not protected or cautious.
Think of 'not' being cautious ('un-') and acting in a way that is 'protected' ('guarded') — that's why unguardedly means acting without caution.