Antonyms of adj lighter-than-air

1 sense of lighter-than-air

Sense 1
lighter-than-air -- (relating to a balloon or other aircraft that flies because it weighs less than the air it displaces)

INDIRECT (VIA light) -> heavy -- (of comparatively great physical weight or density; "a heavy load"; "lead is a heavy metal"; "heavy mahogany furniture")

Similarity of adj lighter-than-air

1 sense of lighter-than-air

Sense 1
lighter-than-air -- (relating to a balloon or other aircraft that flies because it weighs less than the air it displaces)
       => light (vs. heavy) -- (of comparatively little physical weight or density; "a light load"; "magnesium is a light metal--having a specific gravity of 1.74 at 20 degrees C")