indefensibly

As Matt Miller notes in The Washington Post, this is absurd and so indefensibly lazy as to defy comprehension.

It is indefensibly foolish to attempt to explain a man whose whole object through life has been to explain himself.

Val could, most indefensibly, tear her secret out of her keeping in the passion of the moment.

But a statement by a man to an interviewer is felt as indefensibly vulgar.