traitorously

In disloyal fashion

In a manner that betrays trust, allegiance, or duty.

The word carries strong moral condemnation—acting traitorously suggests deliberate disloyalty rather than mere negligence: He traitorously handed over military secrets to the enemy.

The adverb often appears in contexts of national betrayal but extends to any serious breach of faith.

betrayal

perfidiously

With deceitful disloyalty

treacherouslyIn a betraying manner
disloyallyIn a treacherous manner
faithlesslyIn a disloyal manner

deceitfully · double-cross · sellout · backstab · Judas · turncoat · defect · rat · snake · serpent

deception

duplicitously

With deliberate dishonesty

deceitfullyIn a lying manner
dishonestlyIn an untruthful manner
cunninglyWith sly cleverness

slyly · underhandedly · fraudulently · deceptively · misleadingly · scheming · guile · artifice · subterfuge · chicanery

sedition

subversively

In a quietly undermining manner

treasonouslyIn state-betraying manner
rebelliouslyIn a disobedient manner
conspiratoriallyIn secretive partnership manner

mutinously · espionage · sabotage · collusion · infiltration · coup · insurrection · collaborator · defection · undermining

Opposites

loyalty and faithfulness

traitorouslyfaithfully

With unwavering loyalty

loyally · devotedly · steadfastly · dependably · constantly

moral integrity in action

traitorouslyhonorably

With ethical conduct

sincerely · honestly · nobly · uprightly · genuinely

Family

traitorous, traitorousness

Familiarity: Top 500,000
Profile: Used worldwide · Timeless · Abstract · Negative · Everyday, not technical · Rated PG