He went into the investigation with relentless energy, dogged courage, and keen intelligence.

His relentless energy drove the waiting troops into a fever of anticipation.

Mordechai had seen that before, but never coupled with so much relentless energy.

Yet the work offers more than incandescent colorings and relentless energy.

And it calls for relentless energy to plan the endless string of parties, where contributions are most easily extracted.

He still has the relentless energy of a teen-ager.

The two quick movements are notable for their forward drive and relentless energy.

Yet for all the relentless energy, the playing lacked precision and incisiveness.

Why, it's Kelis, showing relentless energy in boosting the economy.

The new films return the genre to the feral, relentless energy of the '70s.