Of an action, emotion, etc.: manifesting or requiring great force or energy; powerful, mighty, strong. Obsolete.

Of actions, measures, etc.: Characterized by, attended, carried out, or enforced with, vigour or energy.

tooth and nail (originally with tooth and nail) adverbial phr.: literal with the use of one's teeth and nails as weapons; by biting and…

Relating to, requiring, or promoting physical strength or hardiness; energetic, vigorous.

Robust, sturdy.

Of action or effort: Vigorous, energetic; now with stronger sense, persistently and ardently laborious. Of conditions, periods, etc.: Characterized…

Of actions (esp. those involving physical effort, as a blow, a shout): Vigorous. Of a meal, etc.: ‘Hearty’, abundant.

Marked or characterized by, requiring or involving, physical strength or activity.