adjective - blue-grey in colour
noun, British English - a small box on a form, screen, or document that can be ticked (checked) or left empty to indicate a choice, selection, or preference
noun, American English - a small box on a form, screen, or document that can be ticked (checked) or left empty to indicate a choice, selection, or preference
adjective - lacking originality, freshness, or significance; overused and uninteresting