setback
available, void
impair=hinder, impede
disperse diffuse divide
area, amount, ambit
A synonym would be repulsive or disturbing.
Antonym-incorrect Synonym-correct
Foe Nemesis OpponentA synomym for enemy is foe
closed in can also be used instead of covered in
An area that is taboo, or hands-off.
A synonym for plausible is possible.
Her story sounded completely plausible.