Antonyms of adj populous

1 sense of populous

Sense 1
populous, thickly settled -- (densely populated)

INDIRECT (VIA inhabited) -> uninhabited -- (not having inhabitants; not lived in; "an uninhabited island"; "gaping doors of uninhabited houses")

Similarity of adj populous

1 sense of populous

Sense 1
populous, thickly settled -- (densely populated)
       => inhabited (vs. uninhabited) -- (having inhabitants; lived in; "the inhabited regions of the earth")