The phrase "despicable of" is correct and can be used in written English.
It is typically used to describe someone's behavior or actions as contemptible or morally wrong. Example: It was despicable of him to cheat on his wife.
Such people, he implies, are the most despicable of all.
He proved that there was good even in the most supposedly despicable of Gotham's inmates.
According to Apuleius, the jealous Venus commanded her son Cupid (the god of love) to inspire Psyche with love for the most despicable of men.
Most despicable of all, said Henry J. Stern, the city parks commissioner, is the marauder who steals into public parks after sundown and snatches the sapling spruces.
Leonie Haimson, the executive director of Class Size Matters, an advocacy group, accused the Education Department of "trying to pit parent against parent in the most despicable of ways".
It remains one of the most despicable of crimes, both because the killing and wounding of innocents are central to its purpose, and because its perpetrators can so easily do their work without having to confront their enemies, or their victims, before slinking off to safety.
Representative Robert Menendez, a Democrat, spoke of the "despicable use of the force of the federal government against a humble, unarmed, law-abiding family".
So what we have here is a righteous condemnation not of the despicable acts of rabble-rousing conservatives, but of Clinton's warning of their consequences.
The heartless, cold manner of this despicable act of evil can never be forgiven or forgotten.
Heads need to roll at Newsweek because of this despicable display of irresponsibility.
Maureen Till, a friend, had told the hearing Sherwood had been the victim of a "despicable" miscarriage of justice.
