Etymology
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mortally (adv.)

late 14c., "to the death; resulting in death," also "bitterly, intensely," from mortal (adj.) + -ly (2).

updated on July 05, 2012

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Definitions of mortally from WordNet

mortally (adv.)
in such a manner that death ensues (also in reference to hatred, jealousy, fear, etc.);
a being of whom the forest Indians are said to be mortally afraid, with a hoof shaped like the heel of a bottle
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.