The antonyms for the word "unhidden" are "hidden", "concealed", "obscured", "veiled", and "camouflaged". These are words that indicate a state of being secretive or not openly visible. When a thing is hidden, it is completely out of view, while when it is obscured, it may be partially visible. Veiled means that something is covered or masked, while camouflaged means that something is designed to blend in with its surroundings. The use of antonyms is a great way to expand vocabulary and express ideas more effectively. By using the right antonyms, writers and speakers can create the right tone and convey their message more clearly.