...from the OED

1. [adj] obs. exc. dial. lukewarm
all the citations are from the 13th through 15th c's; with one exception (which leads to the dialectal tag I guess)

1837 Dickens Pickw. xxxiii, Let me have nine penn'orth o' brandy and water luke.

"Notwithstanding the resemblance in form and meaning, it seems impossible to connect the word etymologically with mod.Du. leuk (lukewarm)"

2. [n] 19th c. slang nothing