Uptight means overly tense, anxious, or strict about rules and proper behavior. An uptight person worries too much about small details and has trouble relaxing or going with the flow.

You might notice someone being uptight when they get stressed about things that don't really matter much. If a friend panics because their handwriting isn't perfectly neat, or if someone becomes anxious when plans change even slightly, they're being uptight. An uptight teacher might give detention for being thirty seconds late to class, while a more relaxed teacher would just wave you to your seat.

Being uptight often makes life harder than it needs to be. When you're uptight about a group project, you might struggle to let others contribute their ideas because you're worried everything won't be exactly perfect. During a game, an uptight player might stop having fun because they're too focused on following every tiny rule.

The opposite of uptight is laid-back or easygoing. Most people are uptight about some things but relaxed about others. Someone might be uptight about keeping their room clean but easygoing about which games to play with friends. If someone tells you to stop being so uptight, they're usually suggesting you relax and worry less about things being perfect.