The phrase "非诚勿扰" is formed through the sequential combination of four characters: 非 (meaning "not" or "unless"), 诚 (meaning "sincerity" or "honest"), 勿 (meaning "do not"), and 扰 (meaning "disturb"). It constructs a conditional imperative where "非诚" sets the condition "if not sincere", and "勿扰" issues the command "do not disturb", directly yielding the literal interpretation "if not sincere, do not disturb".