The expressions that convey the sea’s ruthless nature include:
1- "Their eyes glanced level, and were fastened upon the waves that swept toward them."
This highlights their steady gaze fixed on the waves rolling in, seeking something secure to hold onto.
2- "These waves were of the hue of slate, save for the tops, which were of foaming white, and all of the men knew the colors of the sea."
The mention of slate-colored waves with foamy white tops emphasizes their intimidating appearance, recognized by all the men.
3- "The horizon narrowed and widened, and dipped and rose, and at all times its edge was jagged with waves that seemed thrust up in points like rocks."
The description of the horizon’s shifting outline jagged with pointed waves conveys how rough and fierce the sea is.
4- "These waves were most wrongfully and barbarously abrupt and tall, and each froth-top was a problem in small-boat navigation."
This portrays the waves as violently sudden and towering, making it difficult to navigate a small boat amid the frothy crests.