ag-, agen-, act-, agi-, agit-

1. To stir up (the humours, spirits, etc.); to quicken (the breathing); to set in motion (the blood); to excite.
2. To torment, worry, harass, persecute.

1. Something that a situation demands, or makes, urgently necessary and which puts pressure on the people involved: "They had to cope with the exigencies of the financial situation."
2. A difficult situation requiring urgent action.
3. Urgent requirements; pressing needs.
4. The needs, demands, or requirements intrinsic to circumstances, conditions, etc.

1. Needing immediate action or aid.
2. Making heavy demands on someone.
3. Requiring much effort or expense; demanding, urgent, pressing.

1. Referring to the need for immediate action or remedy: "The financial market called for exigently fast solutions."
2. Characterized by much effort or expense; demanding.

Exigent and pressing suggest an urgency that requires prompt action.