counteract
verb (used with object)
to act in opposition to; frustrate by contrary action.
Used to describe an ongoing action or state that is currently taking place in the immediate present.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
How am I to instil Church principles into them, if he is counteracting me the moment my back is turned?
From Two Years Ago, Volume I by Charles Kingsley