> as lemmas

1720 Casuist 13 Jan. 46/1 The secret Impulse of Nature, which prompted the Soul to look for, and acknowledge some super-efficient Cause of its Existence and Duration.

1857 Tait's Edinb. Mag. July 389/1 The first [specimen] would have been inefficient, the second super-efficient, and both bad—both dangerous.

1922 A. P. Terhune Black Gold ii. 43 This stone-blind valet, so super-efficient in spite of his affliction.

2011 E. Smith DIY Solar Projects 18/2 Installing super-efficient appliances is a major step towards making a smaller, less expensive solar array satisfy the home's energy needs.