1. most covered with spots or marks
Usage: superlative form of spotty
2. most inconsistent or irregular in quality or occurrence
Usage: informal; superlative form of spotty

Examples

• This banana has the spottiest skin of all the fruit.
• Her attendance record was the spottiest in the class.
• The spottiest internet connection made video calls impossible.
• Of all the dogs, the dalmatian had the spottiest coat.
• His performance this season has been the spottiest of his career.
• The spottiest areas of the painting needed more work.