Of the sea, waves: Boiling up, raging. Of water: Welling up, flowing abundantly.

Fluttering, floating, waving, surging.

Rising, swelling, rolling, or tossing heavily, as waves.

Of the sea: Swollen, running high.

Full of surges or billows.

That washes, in various senses of the verb. Surging, overflowing; streaming with water; dipping in the waves.

That flashes, in various senses of the verb.

Having an underswell.

Inclined to roll or (esp. of sea conditions, etc.) cause rolling.