The word "impatient" describes someone who is easily irritated or frustrated due to having to wait for something. There are several synonyms for "impatient" that can be used to add variety to your writing. Some of these include: eager, restless, agitated, intolerant, hasty, uneasy, impetuous, and hard to please. Each of these synonyms has a slightly different connotation, so it is important to choose the one that best fits the situation you are describing. For example, "eager" may be a good choice when describing someone who is excitedly awaiting something, while "restless" may be a better fit for someone who is fidgety and can't sit still while they wait.