Credibly

Can the president credibly commit to that?

A suitor can credibly signal his love for a woman by offering her an expensive and extravagant gift.

He was in a position to commit to a credibly conservative monetary policy.

Bill Clinton was elected on an untenable premise: that it is the job of the President to manage the economy. Yes, that is what we have come to expect of Presidents; but this expectation, the author argues, is punishingly at variance with anything any President can credibly deliver[.]

He [Mayor Koch] says he better understands the limits of government; less credibly, he says he has mellowed.

His deep-set eyes and expression of general despair lend him a look of utter dissolution—very credibly, he is dying from sexual desire.

Perhaps less credibly she assumes that, as a necessary consequence of this move from the public space of the theatre to the private space of the closet, 'the emphasis shifted to subjective interpretation'

In his eyes, if he allowed things to continue as before, he would be little better than a male prostitute. All too credibly, he could imagine himself aging into the superannuated gigolo of Juvenal's satire.

Perhaps, and more credibly, he meant that, had he been at the department, he would have ensured that the president expressly cleared that instruction.