đau đáu

== Vietnamese == === Pronunciation === (Hà Nội) IPA(key): [ʔɗaw˧˧ ʔɗaw˧˦] (Huế) IPA(key): [ʔɗaw˧˧ ʔɗaw˨˩˦] (Saigon) IPA(key): [ʔɗa(ː)w˧˧ ʔɗa(ː)w˦˥] === Adverb === đau đáu restlessly; anxiously; worriedly