I have yet to hear an adequate explanation.
Times, Sunday Times
Students said that four or five lectures were being cancelled every day without an adequate explanation.
The Sun
The tribunal found that differences of treatment with the appropriate comparators had been proved for which, in its judgment, there appeared to be no adequate explanation.
Times, Sunday Times
I never managed to get an adequate explanation out of her before her loss of short-term memory made it certain she would never explain her untypical behaviour.
Times, Sunday Times
It calls attention to the opportunistic glibness of the experts' testimony - without, however, supplying the slightest suggestion of an adequate explanation for his crime.
The Times Literary Supplement