1. swelling or rolling in large waves; having a wavy, undulating appearance
2. full and flowing; puffy or voluminous in appearance

Examples

• The billowy clouds drifted across the summer sky.
• She wore a billowy white dress that caught the breeze.
• Billowy smoke rose from the campfire.
• The curtains created a billowy effect in the wind.
• The ocean had a billowy appearance during the storm.
• Her billowy sleeves made her look elegant.
• The billowy fabric of the tent flapped in the wind.