steadfastly
/ˈstɛdfæstli/ adverb C2- In a steadfast manner; firmly; with conviction. · He steadfastly refuses to go out with her.
From the library
Anne steadfastly refused to confess.
Collins received and returned these felicitations with equal pleasure, and then proceeded to relate the particulars of their interview, with the result of which he trusted he had every reason to be satisfied, since the refusal which his cousin had steadfastly given him would naturally flow from her bashful modesty and the genuine delicacy of her character.
With amazement did she first understand that he believed any apology to be in his power; and steadfastly was she persuaded, that he could have no explanation to give, which a just sense of shame would not conceal.
Noirtier kept his eyes steadfastly fixed on the same spot.
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