Crash-landing is a term that refers to the emergency landing of an aircraft or spacecraft that may not have been successful. There are various synonyms that can be used to describe the same occurrence. Some of these synonyms include rough landing, unplanned landing, uncontrolled landing, forced landing, emergency landing, and hard landing. All these expressions are used to describe the situation where an aircraft or spacecraft is brought down due to technical or other difficulties. While there are many words that can be used as synonyms for crash-landing, they all generally convey the same idea of a sudden, unexpected, and potentially dangerous landing.