trefny.
treyf (not kosher)
Meaning & usage
treyf (not kosher)
illegal (prohibited by established rules)
fishy, shady, suspicious
Where this word comes from
Etymology tree Hebrew טְרֵפָה (trefá)bor. Yiddish טרייף (treyf)bor. Proto-Indo-European *-nós Proto-Balto-Slavic *-inas Proto-Slavic *-ьnъ Old Polish -ny Polish -ny Polish trefny From Yiddish טרייף (treyf) + Polish -ny. By surface analysis, tref + -ny.
funny, amusing
Where this word comes from
Etymology tree German treffendbor. Proto-Indo-European *-nós Proto-Balto-Slavic *-inas Proto-Slavic *-ьnъ Old Polish -ny Polish -ny ? Hungarian tréfásbor. ▲ Polish -ny ? Polish trefny Possibly from German treffend + -ny, less likely from Hungarian tréfás + -ny. Compare trafić.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.