Used for gentle, not strong, or not harsh qualities: mild taste, mild weather, mild personality, mild detergent, etc. A common loanword in everyday Japanese.
This curry is mild, so even children can eat it.
He has a mild personality; I've never seen him angry.
This coffee has a mild taste and is easy to drink.
He has a mild personality and almost never gets angry.
The regulations were revised and became a bit milder than before.
Pale colors give a room a mild impression.