Difference between Dubiously and Doubtfully

DUBIOUSLY vs DOUBTFULLY: ADVERB

In a doubtful manner; with doubt or hesitation; so as to indicate or admit of doubt.

Obscurely, Smugly, Idiotically, Stupidly, Amusingly, Clumsily, Preposterously, Ludicrously, Cynically, Distastefully, Suspiciously, Curiously, Bizarrely, Doubtfully, Questionably

Apprehensively, Inquisitively, Feebly, Irritably, Solicitously, Shyly, Hesitantly, Timidly, Diffidently, Resignedly, Hesitatingly, Questioningly, Incredulously, Quizzically, Dubiously

Uncharitably, Nefariously, Ironically, Duly, Unconvincingly, Strangely, Absurdly, Foolishly, Idiotically, Stupidly, Amusingly, Ludicrously, Distastefully, Bizarrely, Doubtfully

Resentfully, Morosely, Expectantly, Wonderingly, Askance, Disbelievingly, Sheepishly, Apprehensively, Solicitously, Diffidently, Resignedly, Hesitatingly, Questioningly, Incredulously, Quizzically

The Cop removed his helmet and scratched his head dubiously.
Fairly or dubiously acquired degrees makes no difference to people with bushes embedded in their heads.
Kapai also said that Zanaco acquired goalkeeper Toaster Nsabata and defender Chongo Chirwa dubiously.
"Well, I'll try to have a look at it," he says dubiously.
Holloman has good night schools, she regarded her reflection in the mirror dubiously.
Clete returns from Latin America, mixed up rather dubiously with the Mafia geeks.
DEALER STEREOTYPICALLY HAVING DUBIOUSLY MADE ASSURANCES TO TAKE IN NEW DRIVER?
How to turn off a dubiously convenient, definitely eerie feature.
Englebart restocks her dissident acropetally, she tongs it dubiously.
Most cats, for example, dubiously sniff at sweets.

She clarified, Tatsuo continued to eye her doubtfully before turning around to walk away.
The copper lingered doubtfully for a moment, while the motorcyclists drew rapidly away.
Brodie gazed at him doubtfully, feeling that if he took Renwick from her she would surely die.
Like the image above, there are many features that I never have and doubtfully will use.
Real surveys for money and Jepson's smile as he came forward doubtfully.
"A demonstration," he snorted doubtfully, "and just how are you gonna do that.
Miss Harding regarded him doubtfully, but decided that no rebuke was necessary.
All I can say is that they are doubtfully great.
Mr Bloom raised two fingers doubtfully to his lips.
She took it doubtfully, I departed with Fear.