One whose presence is undesirable.

Polish: typ spod ciemnej gwiazdy, przyjemniaczek, rozkoszniaczek

Not wanted:
— Undesirable impurities in steel.
— Legislation excluding undesirable aliens.

synonym: unwanted.

Roget 866: indifferent, cold, frigid, lukewarm; cool, cool as a cucumber; unconcerned, insouciant, phlegmatic, pococurante^†, easygoing, devil-may-care, careless, listless, lackadaisical; half-hearted; unambitious, unaspiring, undesirous^†, unsolicitous^†, unattracted.    [indifferent toward people] aloof, unapproachable, remote; uncaring.    unattractive, unalluring, undesired, undesirable, uncared for, unwished^†, unvalued, all one to.    insipid etc. 391; vain.    ... show more

Roget 830: causing pain, hurting etc. v.; hurtful etc. (bad) 649; painful; dolorific^†, dolorous; unpleasant; unpleasing, displeasing; disagreeable, unpalatable, bitter, distasteful; uninviting; unwelcome; undesirable, undesired; obnoxious; unacceptable, unpopular, thankless.    unsatisfactory, untoward, unlucky, uncomfortable.    distressing; afflicting, afflictive; joyless, cheerless, comfortless; dismal, disheartening; depressing, depressive; dreary, melancholy, grievous, piteous; woeful, rueful, mournful, deplorable, pitiable, lamentable; sad, affecting, touching, pathetic.    irritating, provoking, stinging, annoying, aggravating, mortifying, galling; unaccommodating, invidious, vexatious; troublesome, tiresome, irksome, wearisome; plaguing, plaguy^†; awkward.    importunate; teasing, pestering, bothering, harassing, worrying, tormenting, carking.    intolerable, insufferable, insupportable; unbearable, unendurable; past bearing; not to be borne, not to be endured; more than flesh and blood can bear; enough to drive one mad, enough to provoke a saint, enough to make a parson swear, enough to gag a maggot.    shocking, terrific, grim, appalling, crushing; dreadful, fearful, frightful; thrilling, tremendous, dire; heart-breaking, heart-rending, heart-wounding, heart-corroding, heart-sickening; harrowing, rending.    odious, hateful, execrable, repulsive, repellent, abhorrent; horrid, horrible, horrific, horrifying; offensive.    nauseous, nauseating; disgusting, sickening, revolting; nasty; loathsome, loathful^†; fulsome; vile etc. (bad) 649; hideous etc. 846.    sharp, acute, sore, severe, grave, hard, harsh, cruel, biting, caustic; cutting, corroding, consuming, racking, excruciating, searching, grinding, grating, agonizing; envenomed; catheretic^†, pyrotic [Med.].    ruinous, disastrous, calamitous, tragical; desolating, withering; burdensome, onerous, oppressive; cumbrous, cumbersome.    ... show more

Roget 647: inexpedient, undesirable; unadvisable, inadvisable; objectionable; inapt, ineligible, inadmissible, inconvenient; incommodious, discommodious^†; disadvantageous; inappropriate, unfit etc. (inconsonant) 24.    ill-contrived, ill-advised; unsatisfactory; unprofitable &c.; unsubservient etc. (useless) 645; inopportune etc. (unseasonable) 135; out of place, in the wrong place; improper, unseemly.    clumsy, awkward; cumbrous, cumbersome; lumbering, unwieldy, hulky^†; unmanageable etc. (impracticable) 704; impedient etc. (in the way) 706^†.    unnecessary etc. (redundant) 641.    ... show more

Not worthy of being chosen (especially as a spouse).

synonym: unsuitable.