A clenched fist is a common symbol of anger and aggression, but there are plenty of synonyms that can convey a similar sense of determination and intensity. A closed hand, for example, can suggest someone who is resolute and ready to take action. A tightly gripped fist might indicate pent-up frustration or a desire to confront an adversary. A balled fist or a fist that is firmly planted on a table or desk can convey a sense of authority or dominance. Overall, these synonyms show the power and energy that can come from physical displays of strength and determination.