Former Barcelona winger Deulofeu fired the visitors into a first-half lead before netting twice in as many minutes just after the hour-mark.
Deeney then put the game beyond relegation-haunted Cardiff with his first league goals since the start of January.
Cardiff’s consolation effort came from Sol Bamba.
Watford’s victory took the team up to seventh place, while Cardiff is one point above the relegation zone.
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