General Synonyms:
* Cleverness
* Resourcefulness
* Inventiveness
* Originality
* Creativity
* Innovation
* Brilliance
* Sharpness
* Wits
* Cunning
More Specific Synonyms:
* Mechanical ingenuity: Skill in devising or creating mechanical devices.
* Technical ingenuity: Skill in applying technical knowledge to solve problems.
* Artistic ingenuity: Skill in creating original and imaginative works of art.
The best synonym to use will depend on the specific context of the sentence.