doubtless C2+

/ˈdaʊtləs/ certainly or very probably; without doubt M S

doubtlessly C2+

/ˈdaʊtləsli/ without doubt; certainly M S

dubious C2+

/ˈdubiəs/ hesitating or doubting; of questionable value or truth M S

doubtfully C2+

/ˈdaʊtfəli/ in a manner showing uncertainty or hesitation M S

doubtfulness C2+

/ˈdaʊtfəlnəs/ the quality of being uncertain or open to doubt M S

dubiety C2+

/duˈbaɪəti/ a feeling of doubt or uncertainty M S

undoubtably C2+

/ʌnˈdaʊtəbli/ without doubt; undoubtedly M S