unreservedly

US /ˌʌn.rɪˈzɝː.vɪd.li/
UK /ˌʌn.rɪˈzɝː.vɪd.li/
1.

một cách không dè dặt

completely, without any doubts or feeling of being uncertain:

:
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The paper's editor has apologized unreservedly to the senator.