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Webster 1913 Edition

adv.

In a steadfast manner; firmly.

Steadfastly

believe that whatever God has revealed is infallibly true.

Wake.

, STEDFASTLY,

adv.

Firmly; with constancy or steadiness of mind.

Steadfastly believe that whatever God has revealed is infallibly true.

steadfastly ‎(comparative more steadfastly, superlative most steadfastly)

In a steadfast manner; firmly; with conviction; resolutely.
He steadfastly refuses to go out with her.

in a steadfast manner