Antonyms of adj light-duty

1 sense of light-duty

Sense 1
light-duty (vs. heavy-duty) -- (not designed for heavy work; "a light-duty detergent")

heavy-duty (vs. light-duty) -- (designed for heavy work; "a heavy-duty detergent"; "heavy-duty gloves")
        => heavy -- (large and powerful; especially designed for heavy loads or rough work; "a heavy truck"; "heavy machinery")
        => industrial -- (suitable to stand up to hard wear; "industrial carpeting")

Similarity of adj light-duty

1 sense of light-duty

Sense 1
light-duty (vs. heavy-duty) -- (not designed for heavy work; "a light-duty detergent")
       => light -- (designed for ease of movement or to carry little weight; "light aircraft"; "a light truck")