The word(s) "heavy" appears 16 time(s) in 16 verse(s) in Quran in Muhammad Pickthal translation.

(11) Then those whose scales are heavy, they are the successful.

(12) And tilled fields and heavy-sheathed palm-trees,

(13) We give them comfort for a little, and then We drive them to a heavy doom.

(14) And no burdened soul can bear another's burden, and if one heavy laden crieth for (help with) his load, naught of it will be lifted even though he (unto whom he crieth) be of kin. Thou warnest only those who fear their Lord in secret, and have established worship. He who groweth (in goodness), groweth only for himself, (he cannot by his merit redeem others). Unto Allah is the journeying.

(15) Lo! with Us are heavy fetters and a raging fire,

(16) Then, as for him whose scales are heavy (with good works),