Etymology

interesting

in·ter·est·ing
I1N1T1E1R1E1S1T1I1N1G2

Today it means: Arousing or holding the attention or interest of someone. Full definition →

First used 18th c.
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The story

From interest + -ing.

First known use, by meaning

  • from 18th c. Pregnant. (used with situation and condition)

Etymology from Wiktionary, CC BY-SA 4.0.