Antonyms of adj clean-burning

1 sense of clean-burning

Sense 1
clean-burning -- (leaving little contamination while consuming fuel; "natural gas is a clean-burning fuel")

INDIRECT (VIA fueled) -> unfueled -- (not provided with fuel)

Similarity of adj clean-burning

1 sense of clean-burning

Sense 1
clean-burning -- (leaving little contamination while consuming fuel; "natural gas is a clean-burning fuel")
       => fueled (vs. unfueled) -- (heated, driven, or produced by burning fuel)