Of an action or undertaking: characterized by or exhibiting courage and determination; valiant, bold, spirited. Formerly also of a thing, place…

Of an action, emotion, condition, etc.: characterized by determination or firmness of purpose.

Of an action, state of mind, etc.: fully determined upon, deliberate.

Of personal properties, actions, etc.: Showing determination, unflinching, unwavering.

That has assumed a permanent form or condition; immovable, persistent. Of a feeling, attitude of mind: Fixed, settled, immovable. †Of action…

Of an effort, attempt, etc.: characterized by purpose and determination.

Resolute, firm, vigorous.

Characterized by great effort, urgency, or a determination to succeed. Often with negative connotations.