What is the opposite of dull?
The opposite of dull (edge) is sharp, or pointed.
The opposite of dull (appearance) is shiny, sparkling, bright,
or lustrous.
The opposite of dull (boring subject) is exciting, or
interesting.
The opposite of dull (personality) is lively, interesting,
captivating or intriguing.
The opposite of dull (intelligence) is smart, bright, clever, or
ingenious.