fearfully
3 occurrences across the corpus
King James Version
Psalms 139:14
I will praise thee; for I am fearfully and wonderfully made: marvellous are thy works; and that my soul knoweth right well.
OT Pseudepigrapha
The Sibylline Oracles 1:279
By force of winds, it rushed on fearfully;
The Sibylline Oracles 13:143
And the Syrians shall perish fearfully;