Perky/ˈpɜːrki/ Definition 1 of 3Pro Tip 1/3Positive Mood Used to describe a person showing a lively and happy mood, often infectiously so. Her perky attitude made everyone in the room feel more upbeat. Pro Tip 2/3Not for Sadness Avoid using 'perky' when someone is feeling down or in a serious situation Despite the bad news, she tried to put on a perky face. Pro Tip 3/3Usually Informal 'Perky' is generally used in casual conversations rather than formal or business settings. You seem especially perky today—did something good happen?