1. contestable= A contestable statement, claim, legal decision, etc. is one that is possible to argue about or try to have changed because it may be wrong
e.g. What really happened was, and remains to this day, obscure and contestable.
2. reversal= 01 the act of changing or making something changes to its opposite:
e.g. He demanded a reversal of the previous decision/policy.
02a problem or failure:
e.g. We have suffered a couple of minor/temporary reversals.
3. thorough= detailed and careful:
e.g. a thorough revision of the manuscript
e.g. They did a thorough search of the area but found nothing.