The word "testy" is often used to describe someone who is easily irritated or impatient. There are several synonyms that can be used in place of testy to convey the same meaning. One such synonym is "irritable," which suggests a tendency to become annoyed or agitated quickly. Another synonym is "cranky," which implies a tendency to be easily upset or irritated by things that would not typically bother someone. Other synonyms for testy include "grumpy," "sulky," "morose," and "cantankerous." All of these words convey a sense of irritability or impatience, and can be used to describe someone who is easily frustrated or quick to anger.