いつの間にか の訳語→ eventually naturally occasionally quickly suddenly
うっかり の訳語→ accident accidentally careless carelessly fear heedlessly inadvertent inadvertently injudiciously let nearly thoughtlessly uncertainly unguardedly unintentional unthinkingly venture
思いだしたように の訳語→ erratic odd thoughtfully
放心したように の訳語→ abstractedly blankly