Intermittent: occurring at irregular intervals; not continuous or steady
Sentence: When the cops arrived, the loud intermittent noise has stopped.
Ebb: (Of an emotion or quality) gradually lessen or reduce
Sentence: The water level in the lake will ebb during the drought.
Regress: return to a former or less developed state
Sentence: Rather than regress, you should always strive to move forward.
Tendency: an inclination toward a particular characteristic or type of behavior
Sentence: Why do dogs have the tendency to bark at people they don't know?
Antiseptic: of, relating to, denoting substances that prevent the growth of disease-causing microorganisms
Sentence: It acts as an antiseptic, anti fungal, and antibacterial.