Something that couldn't have been helped or would have happened anyway. It's usually said to relieve someone of the guilt that they have towards a situation, so it also has the connotation of "I don't blame you."
Someone who follows a trend for its popularity, especially when it's lowbrow or mainstream, is considered ミーハー. Definitely has a negative connotation like "poser". Someone who wears Thrasher t-shirts without understanding skate culture is ミーハー.
Means an abundance of wealth usually in reference to something that comes from the earth. You wouldn't use 豊富 to describe a family's private fortune, but you would use it to describe a bountiful garden that can feed a community.
This word describes the feeling of adolescence and youth. It literally translates to blue spring, representing the young blooming part of your life. Usually used nostalgically to refer to a more innocent time.