Many OP brocken hax attacks in Naruto and Naruto Shippuden and i expect worse from Boruto lol, really weren't used to their full potential and here's 10 that i think fit that bill, the war arc honest anime descriptions is taking a while, so here's some naruto for the mean time XD
My Twitter:   / nux_taku  
note: this isnt a list of the top 10 most powerful naruto jutsus, i know ill get some of those in the comments, lmao
Deidara's ultimate art, c0 and even the c4
summoning jutsu, naruto's sasuke's jiraya's etc
sasuke's kirin vs itachi
the mangekyou sharingan's amaterasu
5 kage summit sasuke fought the kages and zetsu's spores
mizukage vs sasuke, her vapor release
shisui's sharingan the koatumatsukami, when danzo had it
8 inner gates, gai vs madara or lee vs gaara
madara has a lot, but his Limbo Clones
subsitution...
inspired by swagkage, lol