in brief

in brief or in short or in a word  {adv. phr.}

Briefly; to give the meaning of what has been said or written in a word or in a few words; in summary.

The children could play as long as they liked, they had no work to do, and nobody scolded them; in short, they were happy.

The speaker didn't know his subject, nor did he speak well; in brief, he was disappointing.