different between terrifically vs terrifyingly

English

terrific +? -ally

terrifically (not comparable)

In a terrific or extreme way.
"The test was terrifically hard," said the tired student.
- 1859, Ferna Vale, Natalie; or, A Gem Among the Sea-Weeds
  Upon examination it was found that a large breakage had been made, directly under their bows, and the sea was rushing in terrifically.

terrifying +? -ly

terrifyingly (comparative more terrifyingly, superlative most terrifyingly)

In a terrifying manner.
The special effects were terrifyingly realistic the first time I saw them.

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