unfaithful

I

(New American Roget's College Thesaurus)

adj. disloyal, faithless; adulterous, philandering, cheating, untrue, fickle; inaccurate, untrustworthy. See improbity, wrong.

II

(Roget's IV) modif.

1. [Not faithful]

Syn. false, untrue, deceitful, foresworn, unreliable, traitorous, treasonable, perfidious, not true to, of bad faith, treacherous, untrustworthy, shifty, unreliable.

Ant. faithful*, constant, loyal.

2. [Having broken the marriage vow]

Syn. adulterous, philandering, incontinent, unchaste; see wicked 1 .

III

(Roget's 3 Superthesaurus) a.

1. disloyal faithless, untrue, treacherous, adulterous, *two-timing, cheating, backstabbing, false, fickle.

2. inaccurate imprecise, inexact, imperfect, incorrect, *off, faulty, erring.

ANT.: 1. loyal, faithful, true. 2. accurate, precise, true

IV

(Roget's Thesaurus II) adjective Not true to duty or obligation: disloyal, faithless, false, false-hearted, perfidious, recreant, traitorous, treacherous, untrue. See CONTINUE, TRUST.