DUBIOUSLY
doubtfully, dubiously
(adverb) in a doubtful manner; “Gerald shook his head doubtfully”
questionably, dubiously
(adverb) in a questionable and dubious manner; “these were estates his father questionably acquired”
Source: WordNet® 3.1
Etymology
Adverb
dubiously (comparative more dubiously, superlative most dubiously)
In a dubious manner.
Accompanied by doubt, or anxious uncertainty.
Source: Wiktionary
Du"bi*ous*ly, adv.
Definition: In a dubious manner.
DUBIOUS
Du"bi*ous, a. Etym: [L. dubius, dubiosus, fr. duo two. See Two, and
cf. Doubt.]
1. Doubtful or not settled in opinion; being in doubt; wavering or
fluctuating; undetermined. "Dubious policy." Sir T. Scott.
A dubious, agitated state of mind. Thackeray.
2. Occasioning doubt; not clear, or obvious; equivocal; questionable;
doubtful; as, a dubious answer.
Wiping the dingy shirt with a still more dubious pocket handkerchief.
Thackeray.
3. Of uncertain event or issue; as, in dubious battle.
Syn.
– Doubtful; doubting; unsettled; undetermined; equivocal;
uncertain. Cf. Doubtful.
Source: Webster’s Unabridged Dictionary 1913 Edition