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Webster 1913 Edition

adv.

In an immortal manner.

adv.

With endless existence; with exemption from death.

immortally ‎(comparative more immortally, superlative most immortally)

In an immortal manner.
- 1918, W. B. Maxwell, chapter 2, in The Mirror and the Lamp:
  She was a fat, round little woman, richly apparelled in velvet and lace, […]; and the way she laughed, cackling like a hen, the way she talked to the waiters and the maid, […]—all these unexpected phenomena impelled one to hysterical mirth, and made one class her with such immortally ludicrous types as Ally Sloper, the Widow Twankey, or Miss Moucher.