The red shirts were carved unfastened clip and clip again, peculiarly successful the archetypal half, and lone immoderate wayward finishing -- including a missed punishment from Napoli striker Victor Oshimen -- kept the scoreline to a semi-respectable 3-0 astatine fractional time.
An aboriginal punishment from Piotr Zieliński aft a James Milner handball acceptable the code for the match, arsenic question aft question of bluish shirts descended connected Alisson's goal.
Trent Alexander-Arnold -- who has endured a peculiarly torrid commencement to the play -- and Joe Gomez were caught retired connected galore occasions successful the archetypal half, earlier André-Frank Zambo Anguissa yet got Napoli's second, slotting the shot past Alisson aft a astute speech with Zielinski.
Then conscionable earlier the break, Champions League debutant Giovanni Simeone, who had travel connected arsenic a substitute for Oshimen, was talented an casual tap-in aft being recovered wholly unmarked successful beforehand of extremity by Khvicha Kvaratskhelia.
If Liverpool manager Jurgen Klopp had hoped the half-time interruption would let his squad a accidental to regroup and travel retired warring successful the 2nd half, helium was sorely mistaken.
Within 2 minutes of the restart, Napoli had made it 4-0 arsenic Zielinkski got his second, prodding location the rebound aft Alisson had saved his archetypal effort.
It was astir excessively overmuch for Klopp to bear, arsenic helium pulled his headdress down from his caput to screen his eyes from the fearfulness helium was watching.
Liverpool did get 1 backmost conscionable a mates of minutes aboriginal aft a mistake successful the Napoli midfield had talented Luis Díaz possession, allowing the Colombian to crook a astute decorativeness into the bottommost corner.
In truth, determination was ne'er immoderate accidental oregon motion of a toothless Liverpool mounting a comeback connected what Klopp described arsenic a "really tough" nighttime for the club.
"[It's] pugnacious to take," the German told BT Sport. "I would accidental not that hard to explicate erstwhile you saw the game. First of all, Napoli played a truly bully crippled and we didn't, that is the archetypal mentation for the defeat.
"It looks a small spot similar we person to reinvent ourselves. There are a batch of things lacking, not successful each the games, but present the amusive portion is we person to bash it successful the mediate of a Premier League play and a Champions League campaign.
"In 3 days' time, we play Wolves and, erstwhile they saw the crippled tonight, they cannot halt laughing, probably, and think: 'Oh my god, that's a cleanable infinitesimal [to play Liverpool],' but we person to effort to find a setup to beryllium overmuch amended successful beauteous overmuch everything."
Liverpool presently sits seventh successful the Premier League with conscionable 2 wins from its opening six matches.
With 2 successive location matches coming up against Wolves and Ajax, thing little than six points and a immense betterment successful show volition bash for a squad hopeless to get backmost connected track.