CONCISENESS
in a nutshell
in a few words; briefly; concisely. (Informal.)I don't have time for the whole explanation. Please give it to me in a nutshell.Well, in a nutshell, we have to work late.
in a word
said simply; concisely said.Mrs. Smith is—in a word—haughty.In a word, the play flopped.
in brief
briefly; concisely.The whole story, in brief, is that Bob failed algebra because he did not study.Please tell me in brief why you want this job.