The word(s) "fierce" appears 8 time(s) in 8 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) Those who were left behind (in the Tabuk expedition) rejoiced in their inaction behind the back of the Messenger of Allah: they hated to strive and fight, with their goods and their persons, in the cause of Allah: they said, "Go not forth in the heat." Say, "The fire of Hell is fiercer in heat." If only they could understand!

(2) It is he whom Allah guides, that is on true Guidance; but he whom He leaves astray - for such wilt thou find no protector besides Him. On the Day of Judgment We shall gather, them together, prone on their faces, blind, dumb, and deaf: their abode will be Hell: every time it shows abatement, We shall increase from them the fierceness of the Fire.

(3) "Besides Allah, and lead them to the Way to the (fierce) Fire!

(4) (They will be) in the midst of a fierce Blast of Fire and in Boiling Water,

(5) "(Which yields) no shade of coolness, and is of no use against the fierce Blaze.

(6) When the Blazing Fire is kindled to fierce heat;

(7) Therefore do I warn you of a Fire blazing fiercely;

(8) (It is) a Fire Blazing fiercely!