Crazily/ˈkreɪzɪli/ Definition 1 of 3Pro Tip 1/3Intensity of Action Use 'crazily' to describe actions that are done with extreme enthusiasm or lack of control. The kids were running crazily around the playground. Pro Tip 2/3Emotional Charge 'Crazily' often indicates the speaker's strong emotional response to the action. She described her vacation as crazily amazing. Pro Tip 3/3Avoid Overuse Don't overuse 'crazily' as it can make your language seem exaggerated or informal. Instead of 'crazily happy,' sometimes just 'very happy' works well.