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The roof was inaccessible/unapproachable for the helicopter due to the flames.


Which word would you use here? Inaccessible? Unapproachable?

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Neither.

The flames prevented the helicopter from approaching the roof.

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anonymousinaccessible/unapproachable for the helicopter

inaccessible to the helicopter

Found online:

inaccessible to fixed-wing aircraft, inaccessible to most army tanks, inaccessible to wheelchairs, inaccessible to vehicles

CJ