Something is unsafe if it has a high risk of danger. The man in the picture has chosen an unsafe way to reach the roof he is working on. Unsafe is the opposite of safe.
Something is untucked if the loose edge of something is flapping and is not held in place. The man in the picture has his shirt untucked. Untucked is the opposite of tucked.
Something is unusual if it is not what you expect for something of that kind. Something unusual is not ordinary. The person in the picture is wearing an unusual hat.
Up is a direction. You go up when you go higher. The person in the picture has just climbed up the ladder and is now sitting at the top. The opposite of up is down.
Update means to add new features or corrections to an existing product, such as a computer, phone, or website.
A tree is uprooted when it falls down with its roots attached, like in the picture. Trees are usually uprooted by storms.
You upset something when you disturb it. You can upset your stomach by eating bad food, or you can upset a pile of something by knocking it over. But when most people say upset they mean to disturb someone's emotions, which often makes them sad and agitated. The child in the picture is upset.