Modifies a noun

• planet: There's still the matter of terraforming the planet etc. , but Mars is looking increasingly viable as an inhabitable planet.

• land: New squatter settlements come up on the periphery often on inhabitable lands because of their low values and cause environmental hazards.

Modifying Another Word

• only: As the Government's own chief scientific advisor has noted, Antarctica may be the only inhabitable continent by the end of the century.