pessimistic

cynical, fatalistic, nihilist, nihilistic

desperate, discouraging, disheartening, inauspicious, unlikely, unpromising

bleak, cheerless, comfortless, depressing, desolate, dismal, dreary, funereal, gloomy, morose, saturnine, sepulchral, somber (or sombre), sullen

grim

contrary, hostile, negative

distrustful, mistrustful, negativist, negativistic, skeptical, suspicious

derisive, mocking, sardonic, scornful

defeatist, fatalistic, negative

ironic (also ironical), sarcastic

jaded, sophisticated, worldly-wise

hard-bitten, hard-boiled, hardcase, hard-edged, unsentimental