Corinne lowered her eyes, feeling as though she'd been too boastful.

Louis, in his latter words, was a little too boastful.

Or, if you think that is too boastful, a brigadier.

Still, on the whole, it is impossible to be too boastful even of that boon.

But perhaps saying she could kill a hundred warrior gholas is a bit too boastful.

Then heedful Penelope said to her, Dear nurse, be not too boastful yet, nor filled with glee.

"Ah, you are too boastful," said the lieutenant.