Use 'choppy' to describe the sea during windy weather or storms. The fishing trip was canceled due to the unexpectedly choppy waters.
Pro Tip 2/3
Avoid with Calm
'Choppy' contrasts with 'calm'; don't use to describe peaceful conditions. The forecast ruled out choppy seas, promising a smooth voyage ahead.
Pro Tip 3/3
Safety Concern
Mention 'choppy' conditions as a warning for potential danger in water activities. Due to the choppy conditions, the swim race was postponed for safety.