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unaccountable /ənəˈkaʊn(t)əb(ə)l/
adjective
1 unable to be explained:
a strange and unaccountable fact.
• (of a person or their behavior) unpredictable and strange.
2 (of a person, organization, or institution) not required or expected to justify actions or decisions; not responsible for results or consequences:
there are enormous risks in leaving such agencies uncontrolled and unaccountable | a powerful and unaccountable institution.

Thesaurus
unaccountable /ənəˈkaʊn(t)əb(ə)l/
adjective
1
for some unaccountable reason, the dogs have been pacing the floor all evening: INEXPLICABLE, insoluble, incomprehensible, unfathomable, impenetrable, puzzling, perplexing, baffling, bewildering, mystifying, mysterious, inscrutable, peculiar, strange, queer, odd, obscure; informal weird, freaky.
2
a private company unaccountable to voters: NOT ANSWERABLE, not liable, not responsible; free, exempt, immune; unsupervised.

Last week's word

bogus /ˈbəʊɡəs/
adjective
not genuine or true; fake:
a bogus insurance claim.

Thesaurus
bogus /ˈbəʊɡəs/
adjective
a bogus insurance claim | a bogus lottery ticket: FAKE, spurious, false, fraudulent, sham, deceptive; counterfeit, forged, feigned; make-believe, dummy, pseudo, phony, pretend, fictitious. ANTONYMS genuine.

ORIGIN
late 18th century (originally US, denoting a machine for making counterfeit money): of unknown origin.