That which is below standard or expectations as of ethics or decency:
— Take the bad with the good.

synonym: badness.

Roget 401: fetor^†; bad etc. adj.. smell, bad odor; stench, stink; foul odor, malodor; empyreuma^†; mustiness etc. adj.; rancidity; foulness etc. (uncleanness) 653.    stoat, polecat, skunk; assafoetida^†; fungus, garlic; stinkpot; fitchet^†, fitchew^†, fourmart^†, peccary.    acridity etc. 401.1. ... show more

Having undesirable or negative qualities.

Roget 653: dirty, filthy, grimy; unclean, impure; soiled etc. v.; not to be handled with kid gloves; dusty, snuffy^†, smutty, sooty, smoky; thick, turbid, dreggy; slimy; mussy [U.S.].    slovenly, untidy, messy, uncleanly.    [of people] unkempt, sluttish, dowdy, draggle-tailed; uncombed.    unscoured^†, unswept^†, unwiped^†, unwashed, unstrained, unpurified^†; squalid; lutose^†, slammocky^†, slummocky^†, sozzly^†.    nasty, coarse, foul, offensive, abominable, beastly, reeky, reechy^†; fetid etc. 401.    [of rotting living matter] decayed, moldy, musty, mildewed, rusty, moth-eaten, mucid^†, rancid, weak, bad, gone bad, etercoral^†, lentiginous^†, touched, fusty, effete, reasty^†, rotten, corrupt, tainted, high, flyblown, maggoty; putrid, putrefactive, putrescent, putrefied; saprogenic, saprogenous^†; purulent, carious, peccant; fecal, feculent; stercoraceous^†, excrementitious^†; scurfy, scurvy, impetiginous^†; gory, bloody; rotting etc. v.; rotten as a pear, rotten as cheese.    crapulous etc. (intemperate) 954^†; gross etc. (impure in mind) 961; fimetarious^†, fimicolous^†.    ... show more

Roget 649: hurtful, harmful, scathful^†, baneful, baleful; injurious, deleterious, detrimental, noxious, pernicious, mischievous, full of mischief, mischief-making, malefic, malignant, nocuous, noisome; prejudicial; disserviceable^†, disadvantageous; wide-wasting.    unlucky, sinister; obnoxious; untoward, disastrous.    oppressive, burdensome, onerous; malign etc. (malevolent) 907.    corrupting etc. (corrupt) etc. 659; virulent, venomous, envenomed, corrosive; poisonous etc. (morbific) 657^†; deadly etc. (killing) 361; destructive etc. (destroying) 162; inauspicious etc. 859.    bad, ill, arrant, as bad as bad can be, dreadful; horrid, horrible; dire; rank, peccant, foul, fulsome; rotten, rotten at the core.    vile, base, villainous; mean etc. (paltry) 643; injured &c.; deteriorated etc. 659; unsatisfactory, exceptionable indifferent; below par etc. (imperfect) 651; illcontrived, ill-conditioned; wretched, sad, grievous, deplorable, lamentable; pitiful, pitiable, woeful etc. (painful) 830.    evil, wrong; depraved etc. 945; shocking; reprehensible etc. (disapprove) 932.    hateful, hateful as a toad; abominable, detestable, execrable, cursed, accursed, confounded; damned, damnable; infernal; diabolic etc. (malevolent) 907.    unadvisable etc. (inexpedient) 647; unprofitable etc. (useless) 645; incompetent etc. (unskillful) 699; irremediable etc. (hopeless) 859.    ... show more

Roget 619: disastrous, bad etc. 649; awry, out of joint; disadvantageous.   

Roget 401: fetid; strong-smelling; high, bad, strong, fulsome, offensive, noisome, rank, rancid, reasty^†, tainted, musty, fusty, frouzy^†; olid^†, olidous^†; nidorous^†; smelling, stinking; putrid etc. 653; suffocating, mephitic; empyreumatic^†.    ... show more

Roget 932: disapproving etc. v.; scandalized.    disparaging, condemnatory, damnatory^†, denunciatory, reproachful, abusive, objurgatory^†, clamorous, vituperative; defamatory etc. 934.    satirical, sarcastic, sardonic, cynical, dry, sharp, cutting, biting, severe, withering, trenchant, hard upon; censorious, critical, captious, carping, hypercritical; fastidious etc. 868; sparing of praise, grudging praise.    disapproved, chid etc. v.; in bad odor, blown upon, unapproved; unblest^†; at a discount, exploded; weighed in the balance and found wanting.    blameworthy, reprehensible etc. (guilt) 947; to blame, worthy of blame; answerable, uncommendable, exceptionable, not to be thought of; bad etc. 649; vicious etc. 945.    unlamented, unbewailed^†, unpitied^†.    ... show more

Very intense:
— A bad headache.
— Had a big (or bad) shock.
— A bad earthquake.
— A bad storm.

synonym: big.

Feeling or expressing regret or sorrow or a sense of loss over something done or undone:
— He felt bad about breaking the vase.

synonyms: regretful, sorry.

Polish: przebłagalny

Feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad'):
— My throat feels bad.
— She felt bad all over.

synonym: tough.

of foodstuffs Not in an edible or usable condition:
— Bad meat.

synonyms: spoiled, spoilt.

Polish: popsuty, zepsuty

Not capable of being collected:
— A bad (or uncollectible) debt.

synonym: uncollectible.

Below average in quality or performance.

Polish: cienki

Nonstandard.

Not financially safe or secure:
— A bad investment.

synonyms: high-risk, risky, speculative.

Physically unsound or diseased:
— Has a bad back.
— A bad heart.
— Bad teeth.

synonyms: unfit, unsound.

Roget 923: wrong, wrongful; bad, too bad; unjust, unfair; inequitable, unequitable^†; unequal, partial, one-sided; injurious, tortious [Law].    objectionable; unreasonable, unallowable, unwarrantable, unjustifiable; improper, unfit; unjustified etc. 925; illegal etc. 964; iniquitous; immoral etc. 945.    in the wrong, in the wrong box.    ... show more

Capable of harming.

Characterized by wickedness or immorality.

Reproduced fraudulently:
— Like a bad penny....

synonym: forged.

Not working properly:
— A bad telephone connection.

synonym: defective.

With great intensity (`bad' is a nonstandard variant for `badly'):
— The injury hurt badly.
— The buildings were badly shaken.
— It hurts bad.
— We need water bad.

synonym: badly.

Very much; strongly:
— I wanted it badly enough to work hard for it.
— The cables had sagged badly.
— They were badly in need of help.
— He wants a bicycle so bad he can taste it.

synonym: badly.