The word "frustrative" is defined as something that causes frustration or annoyance. There are several synonyms for this word, including vexatious, aggravating, irritating, irksome, and exasperating. These words all convey a sense of irritation or annoyance caused by a frustrating situation or obstacle. Other synonyms may include maddening, infuriating, and provoking. These words are useful when describing situations or circumstances that elicit a strong emotional response, such as a difficult project at work or a stubborn piece of technology. Using synonyms can help to add variety and nuance to writing or speech, making it more engaging and descriptive.