IPA: /ˌʌl.trə.ɪˈfɪ.ʃənt/
KK: /ʌltrɪˈfɪʃənt/
This word describes something that works in a very effective way, achieving maximum results with minimal waste or effort.
The new engine design is ultraefficient, using less fuel while providing more power.
Ultraefficient → It is formed from "ultra-" (meaning beyond or extreme) and "efficient" (from Latin "efficere", meaning to accomplish or to bring about). The word "ultraefficient" means extremely effective or capable of achieving maximum productivity with minimal waste.
Think of 'ultra-' meaning beyond, and 'efficient' meaning to accomplish something well — together, they describe something that works extremely well.