1. stagnant or foul water that collects in a ditch
Usage: usually uncountable
2. something dull, uninteresting, or of poor quality
Usage: informal; used in the phrase 'dull as ditchwater'

Examples

• The old ditch was filled with ditchwater that smelled terrible.
• After the rain, ditchwater pooled along the roadside.
• The lecture was dull as ditchwater and put everyone to sleep.
• He found the movie dull as ditchwater and left halfway through.
• The ditchwater attracted mosquitoes and other insects.
• Her writing style was as dull as ditchwater, lacking any spark of creativity.