Word Study
unprincipled
CIDE DICTIONARY
unprincipled, a. [Pref. un- not + principled.].
Being without principles; especially, being without right moral principles; also, characterized by absence of principle. [1913 Webster]
OXFORD DICTIONARY
unprincipled, adj. lacking or not based on good moral principles.
Derivative
unprincipledness n.
THESAURUS
unprincipled
amoral, conscienceless, corrupt, corrupted, criminal, crooked, dark, devious, dishonest, dishonorable, dissolute, doubtful, dubious, evasive, felonious, fishy, fraudulent, ill-got, ill-gotten, immoral, indirect, insidious, licentious, mercenary, not kosher, profligate, questionable, reprobate, rotten, shady, shameless, shifty, sinister, slippery, stick-at-nothing, suspicious, tricky, unconscienced, unconscientious, unconscionable, underhand, underhanded, unethical, unsavory, unscrupulous, unstraightforward, venal, without remorse, without shameROGET THESAURUS
unprincipled
Vice
N vice, evil-doing, evil courses, wrongdoing, wickedness, viciousness, iniquity, peccability, demerit, sin, Adam, old Adam, offending Adam, immorality, impropriety, indecorum, scandal, laxity, looseness of morals, enphagy, dophagy, exophagy, want of principle, want of ballast, obliquity, backsliding, infamy, demoralization, pravity, depravity, pollution, hardness of heart, brutality, corruption, knavery, profligacy, flagrancy, atrocity, cannibalism, lesbianism, Sadism, infirmity, weakness, weakness of the flesh, frailty, imperfection, error, weak side, foible, failing, failure, crying sin, besetting sin, defect, deficiency, cloven foot, lowest dregs of vice, sink of iniquity, Alsatian den, gusto picaresco, fault, crime, criminality, sinner, brothel, gambling house, joint, opium den, shooting gallery, crack house, vicious, sinful, sinning, wicked, iniquitous, immoral, unrighteous, wrong, criminal, naughty, incorrect, unduteous, undutiful, unprincipled, lawless, disorderly, contra bonos mores, indecorous, unseemly, improper, dissolute, profligate, scampish, unworthy, worthless, desertless, disgraceful, recreant, reprehensible, blameworthy, uncommendable, discreditable, disreputable, Sadistic, base, sinister, scurvy, foul, gross, vile, black, grave, facinorous, felonious, nefarious, shameful, scandalous, infamous, villainous, of a deep dye, heinous, flagrant, flagitious, atrocious, incarnate, accursed, Mephistophelian, satanic, diabolic, hellish, infernal, stygian, fiendlike, hell-born, demoniacal, devilish, fiendish, miscreated, misbegotten, demoralized, corrupt, depraved, evil-minded, evil-disposed, ill-conditioned, malevolent, heartless, graceless, shameless, virtueless, abandoned, lost to virtue, unconscionable, sunk in iniquity, lost in iniquity, steeped in iniquity, incorrigible, irreclaimable, obdurate, reprobate, past praying for, culpable, reprehensible, unjustifiable, indefensible, inexcusable, inexpiable, unpardonable, irremissible, weak, frail, lax, infirm, imperfect, indiscrete, demoralizing, degrading, wrong, sinfully, without excuse, Int, O tempora!, O mores!, alitur vitium vivitque tegendo, genus est mortis male vivere, mala mens malus animus, nemo repente fuit turpissimus, the trail of the serpent is over them all, to sanction vice and hunt decorum down.For further exploring for "unprincipled" in Webster Dictionary Online