What is another word for contrary to all reason?
Pronunciation: [kˈɒntɹəɹˌɪ tʊ ˈɔːl ɹˈiːzən] (IPA) 
The phrase "contrary to all reason" denotes something that defies logical explanation or common sense. There are multiple synonyms for this phrase, including "illogical," "irrational," "absurd," "unreasonable," "implausible," and "preposterous." These words all indicate a disregard for logic and reason, suggesting that the situation or statement is nonsensical and potentially even shocking. Other potential synonyms for "contrary to all reason" may include "unfounded," "baseless," "groundless," and "unsupported." These words all carry a similar connotation of a lack of rationality or justification, indicating that the claim or situation in question is not based in reason or fact.
