ingenuities

The boy showed ingenuity in making toys.

We were amazed at the ingenuity with which they solved their difficulties.

Not seldom it happens that the unwearying ingenuity of the Oriental leads to fresh tortures.

a book that is difficult (or hard ) to find. Difficult, however, is often preferable where the need for skill or ingenuity is implied:

an invention that exceeds all others in ingenuity), to being greater than another, as in degree or quantity (

Sometimes it is said that discrete power amplifier design is rather unenterprising, given the enormous outpouring of ingenuity in the design of analogue ICs.