counteract

As a verb counteract

is to act in opposition to; thwart; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice.

As a noun counterforce is

a force that opposes another force.

As verbs the difference between counteract and equalize

is that counteract is to act in opposition to; thwart; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice while equalize is to make equal; to cause to correspond in amount or degree.

Counteract is a related term of thwart.

As verbs the difference between counteract and thwart

is that counteract is to act in opposition to; thwart; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice while thwart is to prevent; to halt; to cause to fail; to foil; to frustrate.

As a noun thwart is

(nautical) a brace, perpendicular to the keel, that helps maintain the beam (breadth) of a marine vessel against external water pressure and that may serve to support the rail.

As an adjective thwart is

situated or placed across something else; transverse; oblique.

As an adverb thwart is

obliquely; transversely; athwart.

Counteract is a related term of oppose.

As verbs the difference between counteract and oppose

is that counteract is to act in opposition to; thwart; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice while oppose is .

As a noun oppose is

opposite.

As an adjective oppose is

opposite.

As verbs the difference between counteract and defeat

is that counteract is to act in opposition to; thwart; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice while defeat is to overcome in battle or contest.

As a noun defeat is

the act of defeating or being defeated.

As verbs the difference between prevail and counteract

is that prevail is to be superior in strength, dominance, influence or frequency; to have or gain the advantage over others; to have the upper hand; to outnumber others while counteract is to act in opposition to; thwart; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice.

As verbs the difference between counterattack and counteract

is that counterattack is an alternative spelling of from=US|lang=en while counteract is to act in opposition to; thwart; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice.

As a noun counterattack

is an alternative spelling of from=US|lang=en.

As verbs the difference between counteract and undermine

is that counteract is to act in opposition to; thwart; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice while undermine is to dig underneath (something), to make a passage or for destructive or military purposes; to sap.

As verbs the difference between negate and counteract

is that negate is to deny the existence, evidence, or truth of; to contradict while counteract is to act in opposition to; thwart; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice.

As verbs the difference between counteract and cancel

is that counteract is to act in opposition to; thwart; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice while cancel is to cross out something with lines etc.

As a noun cancel is

a cancellation (US); (nonstandard in some kinds of English).