Acting like a blowhard can easily be substituted with other colorful phrases that appropriately convey the same meaning. Some synonyms include being a braggart, a windbag, or a gasbag. Other options could be a loudmouth, pontificating, or simply talking too much. When someone is acting like a blowhard, they often raise their voice and exaggerate their accomplishments. It can be frustrating to listen to someone who never stops talking about themselves, leaving no room for others to express their thoughts. Calling out this behavior can be difficult, but using a synonym for "act the blowhard" may be a more subtle way to communicate the issue.