Cause Postponement is a term used to describe when an event or activity is delayed due to unfavorable weather conditions. The two crossword solutions for this term are RAIN (4 letters) and RAINY (5 letters). RAIN is a form of precipitation that falls from the sky, while RAINY is an adjective used to describe weather that is wet and damp due to RAIN. Both of these words can be used to explain why an event or activity may be postponed.