The word(s) "seas" appears 20 time(s) in 19 verse(s) in Quran in Abdullah Yusuf Ali translation.

(11) And behold! The Hypocrites and those in whose hearts is a disease (even) say: "Allah and His Messenger promised us nothing but delusion!"

(12) O Consorts of the Prophet! Ye are not like any of the (other) women: if ye do fear (Allah), be not too complacent of speech, lest one in whose heart is a disease should be moved with desire: but speak ye a speech (that is) just.

(13) Truly, if the Hypocrites, and those in whose hearts is a disease, and those who stir up sedition in the City, desist not, We shall certainly stir thee up against them: Then will they not be able to stay in it as thy neighbours for any length of time:

(14) Those who believe say, "Why is not a sura sent down (for us)?" But when a sura of basic or categorical meaning is revealed, and fighting is mentioned therein, thou wilt see those in whose hearts is a disease looking at thee with a look of one in swoon at the approach of death. But more fitting for them-

(15) Or do those in whose hearts is a disease, think that Allah will not bring to light all their rancour?

(16) And His are the Ships sailing smoothly through the seas, lofty as mountains:

(17) Whose season is not limited, nor (supply) forbidden,

(18) "Indeed ye shall drink like diseased camels raging with thirst!"

(19) And We have set none but angels as Guardians of the Fire; and We have fixed their number only as a trial for Unbelievers,- in order that the People of the Book may arrive at certainty, and the Believers may increase in Faith,- and that no doubts may be left for the People of the Book and the Believers, and that those in whose hearts is a disease and the Unbelievers may say, "What symbol doth Allah intend by this?" Thus doth Allah leave to stray whom He pleaseth, and guide whom He pleaseth: and none can know the forces of thy Lord, except He and this is no other than a warning to mankind.