peace and quiet; safe and peaceful; tranquil and uneventful
Describes a state free from trouble, danger, or disturbance; often used for uneventful journeys or calm situations.
The trip ended safely and uneventfully.
This town is always peaceful and quiet.
無事 means 'safety' or 'without incident' and is more common; 無事太平 adds a nuance of lasting peace and tranquility.
太平 means 'peace' or 'tranquility' on its own; 無事太平 combines both safety and peace.
A four-character compound combining 無事 (safety, without incident) and 太平 (peace, tranquility). The exact historical derivation is uncertain, but it likely arose as an emphatic expression for a state of complete peace and safety.