1. Noun, Na-adjective (keiyodoshi)

   hurry; rush; flurry

2. Na-adjective (keiyodoshi), Noun

   simple; brief; quick

3. rough; crude; careless; inadequate

4. Expressions (phrases, clauses, etc.)

   yours sincerely; yours in haste

   letters ending with this start with 前略, 冠省, etc.see 匆々

Also written 草草【そうそう】sousou