Synonyms for interfere

These verbs mean to intervene unasked in the affairs of others and often in an impudent or indiscreet manner. Interfere implies action that seriously hampers, hinders, or frustrates: “Romantics of all ages can recall occasions when lust interfered with reason” (Christine Gorman).
Meddle stresses unwanted, unwarranted, or unnecessary intrusion: “wholly unacquainted with the world in which they are so fond of meddling” (Edmund Burke).
To tamper is to interfere by making unsought, unwelcome, often destructive changes or by trying to influence another in an improper way: “a large number of persons accused of . . . tampering with ballot boxes” (James Bryce).