Proper, Suitable, Irresponsible
noun, な adjective
Everything is suitable and right. Therefore it is appropriate, proper, and suitable. Strangely enough, this also means irresponsible. Maybe it's because when everything is suitable and right for you, you're taking too much and not leaving enough for everyone else, making you irresponsible?
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
Please choose the appropriate answer.
That guy often says irresponsible things.
I was surprised when my colleague was ordering in an izakaya and said to the waitress: "Choose whatever you think is best".