You can use boastful in a sentence like this.
Sam was very boastful after they won the game.
The ghost toasted most of the host's boasts during the roast.
If you boast when you win you are rude. means to show-off
He will boast about the high cost of his new house.
"I know you did a great job on your exam, but there is no reason for you to boast about it." Boast means the same thing as bragging.
The child started to boast that he got the best score in the class.
The pirate captains would get drunk and boast of their latest exploits. The governor once made a boast that he could not lose an election, but he eventually did. "Let others boast for you."
Emma loved to boast about her dog Princess.
Carly loves to boast all of the time!
One may use any of several prepositions with the verb to boast, including:boast of (deeds, exploits)boast about (abilities, charcateristics)boast to (anyone listening)boast among (ones peers, or a group)
Larrikin love, meanwhile, boast a charming mess of influences: they have a surprisingly effective line in spindly white reggae.
boast
Well to brag means to boast... so you could say "My worst enemy won a swimming competition and is going to brag about it tomorrow...." or "My friend got an A* for maths and keeps bragging about it."