Intense in degree or quality; not mild or weak; severe, violent, strong. of a conflict, contest, etc. Obsolete.

Severe, burdensome, oppressive. Of a battle, fight, debate: fierce, hotly contested.

Violent, harsh, severe. Of fighting, contention, or blows: vehement, fierce. Obsolete (Scottish or archaic in later use).

strong, fierce.

Of a fight, battle: Fiercely contested. Obsolete.

Eager, impetuous, violent. Of conflict, warfare, an attack: Carried on with vigour, fierce, keen.

Of a fight: Stoutly contested, severe. Obsolete.

Of a battle: Fierce, violent. Obsolete.

Of battle or other conflicts: Severe, fierce, hot.

Of personal action: characterized by great physical exertion or effort; performed with unusual force or violence; vigorous; strenuous, effortful…

Severe, sharp, hard. Of conflict or effort. Obsolete.

Intensely or excessively acute.

Having fury, furious.