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prolly adj. stresses
gen.	возможно (Artjaazz); наверняка (Artjaazz)
inf.	вероятно (ZarinD); верняк (short for probably Artjaazz)
slang	наверное (clipped pronunciation of "probably" [colloquial, slang, notably Internet slang] Artjaazz)
English thesaurus
prolly abbr.
abbr.	probably (acrogamnon)