The correct answer would be, meliorate; habituation.
As soon as Mario retired, he moved to Florida and went for walks on the beech every day. Unfortunately, although going for walks continued to be his most enjoyable activity, it soon became less enjoyable than it used to be. This appears to be an example of how the tendency to meliorate can result in long term Habituation.
Explanation:
When someone has a tendency to make things better or satisfactory for himself, it is called as meliorate or ameliorate. Habituation is something a person is being habituated to. When something becomes a habit, it becomes a routine of a person, and is called as Habituation.
It is a general rule, that when you start something, or the thing is new, it is more pleasurable and attractive, but with the passage of time, when that thing or doing something becomes a routine, it becomes a habit and is called habituation.
So Mario used to feel pleasure in walking at beech at the start but soon it became his habit.
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