In theory, an adverb can be formed by adding the "-ly" suffix to any adjective. Examples include "happy" > "happily", "weird" > "weirdly", etc.

So I've been having fun with some very strange adverbs.

• uglily
• bluely
• sugarily
• scaredly (not an odd word really, but it wasn't in the dictionary)
• Communistically
• left-to-rightly

• "He uglily crept down the hallway."
• "The depressed man trudged bluely across the street."
• "The three-year-old bounced sugarily around the room."
• "He peered scaredly at the open door."
• "Stalin seized control Communistically."
• "He walked to the street and peered at it left-to-rightly."