Synonyms for Not a prayer:

• adj.

  •despairing (adjective)
  • disconsolate,
  • sad,
  • sunk,
  • dejected,
  • frantic,
  • melancholy,
  • suicidal,
  • melancholic,
  • desperate,
  • oppressed,
  • depressed,
  • grief-stricken,
  • brokenhearted,
  • forlorn,
  • inconsolable,
  • pessimistic,
  • blue,
  • miserable,
  • downcast,
  • anxious,
  • weighed down,
  • cynical.
  •risky (adjective)
  • long shot,
  • endangered,
  • rocky,
  • dicey,
  • iffy,
  • out on a limb,
  • hairy,
  • hazardous,
  • chancy,
  • delicate,
  • sensitive,
  • tricky,
  • perilous,
  • wide-open,
  • insecure,
  • wicked,
  • treacherous,
  • ticklish,
  • precarious,
  • unsafe,
  • venturesome,
  • unsound,
  • unhealthy,
  • uncertain,
  • Jeopardous,
  • touchy,
  • touch-and-go.
  •unattainable (adjective)
  • unrealizable.
  •unnegotiable (adjective)
  • un negotiable,
  • un-negotiable.
  •unrealizable (adjective)
  • un realizable,
  • un-realizable.
  •vain (adjective)
  • trifling,
  • delusory,
  • unimportant,
  • empty,
  • on treadmill,
  • senseless,
  • abortive,
  • worthless,
  • petty,
  • unproductive,
  • unprofitable,
  • delusive,
  • sterile,
  • idle,
  • paltry,
  • going nowhere,
  • pointless,
  • valueless,
  • nugatory,
  • trivial,
  • Shucker,
  • slight,
  • barren,
  • puny,
  • fruitless,
  • hollow,
  • void,
  • otiose,
  • on a treadmill,
  • misleading,
  • shuck,
  • profitless,
  • frivolous,
  • unnotable,
  • insignificant,
  • in vicious circle,
  • time-wasting,
  • bootless,
  • unavailing.

• n.

  •fat chance (noun)
  • unthinkable.

• Other synonyms:

  •adj.
  • hopeless,
  • illogical,
  • risky,
  • wretched,
  • hanging by a thread,
  • in the dumps,
  • off the deep end,
  • despairing,
  • impossible,
  • inoperable,
  • no-win,
  • nonfunctional,
  • nonviable,
  • unserviceable,
  • unusable,
  • vain,
  • unnegotiable,
  • Unbusinesslike,
  • fraught with danger,
  • on thin ice,
  • in pain,
  • at end of one's rope,
  • at end of rope,
  • can't win,
  • going for broke,
  • griefstricken,
  • hanging by thread,
  • in the pits,
  • in the soup,
  • ivory-tower,
  • non-functional,
  • off deep end,
  • on slippery ground,
  • on the spot,
  • out on limb,
  • playing with fire,
  • shot down,
  • strabilious,
  • touch and go,
  • wide open,
  • won't fly.
  •n.
  • fat chance,
  • slim chance,
  • no way,
  • when hell freezes over,
  • no chance,
  • no ways,
  • poor possibility,
  • poor prospect,
  • small chance,
  • chance in a million,
  • ghost of a chance,
  • poor outlook,
  • snowball's chance in hell,
  • very little chance,
  • impossibles.

Antonyms for Not a prayer:

• adj.

  • despairing
    encouraged, expectant, cheerful, happy, confident, joyous, hopeful.
  • impossible
    tenable, tolerable, logical, imaginable, believable, reasonable, obtainable, achievable, practical, manageable, possible, conceivable, sensible, Behaving, governable, good.
  • impractical/impracticable
    probable, realistic, viable, practicable.
  • insurmountable
    beatable, surmountable, defeatable, attainable.
  • risky
    healthy, assured, protected, definite, safe, harmless, honest, certain, strong, well, sure, stable, insensitive, secure.
  • unattainable
    open.
  • unworkable
    rational.
  • vain
    modest, useful, shy, consequential, significant, important.