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safeness is the opposite of:

• dangerousness (noun) - the quality of not being safe

safeness is a type of:

• characteristic (noun) - a distinguishing quality

safeness is derivationally related to:

• dependable, good, safe, secure (adjective) - financially sound
• safe (adjective) - (of an undertaking) secure from risk
• safe (adjective) - free from danger or the risk of harm