It sounds boastful, I know; but it is true.

He didn't want to sound boastful, or perhaps he did, but 'twas the truth.

Adams sounded almost boastful, but Judson had to admit that the statement was correct.

His voice sounded almost boastful, but when he spoke again it was with a note of pleading.

If Faldo sounds boastful, consider that other players are saying the same thing.

"I can understand what it says," Chaumel said, too fascinated to sound boastful.

Then, sensing that he might have sounded too boastful, the Mayor tried to pull back a bit.

On their own, out of context, Rivera's words could've sounded boastful.

Your aim should be to emphasize your goods points without sounding boastful.

I do not want to sound boastful, but my report should not be reduced to that issue.