Wide-awake means completely alert and fully conscious, with no hint of sleepiness or drowsiness. When you're wide-awake, your mind is sharp and your senses are keen, like on Christmas morning when excitement jolts you out of bed long before your alarm goes off.

The word describes a state of full mental and physical alertness. A student who stayed up too late might technically be awake in class but certainly not wide-awake, slumping over their desk and struggling to focus. Someone who is wide-awake is ready to think, react, and engage with whatever's happening around them.

You might be wide-awake at midnight because of thunderstorms, or wide-awake during an exciting soccer match because the score is tied and anything could happen. Parents sometimes tell children to “stay wide-awake” during long car trips through the mountains, both to enjoy the scenery and to help the driver stay alert by talking.

The term can also describe someone who is perceptive and aware of what's really going on in a situation. A wide-awake student notices when the class troublemaker is about to pull a prank, or when a friend seems upset even though they say everything is fine.