Answer:
Luxury
Explanation:
A connotation is how you feel when you hear that word- positive emits good feelings, and negative is associated with bad or sad feelings.
Not extra or nicety: Both of these words do not always mean positive. Extra can be bad, like "We have extra homework." Nicety is not supposed to have a positive feeling, instead, it almost looks down upon the good extra things.
Not bonus: Bonus is usually a positive thing- bonus pay, bonus points, etc. The synonyms are also all positive- benefit, gift, prize, etc.
Why Luxury? Luxury is a realistically exaggerated version of a bonus. Luxury is an extravagant life- it is longer than temporary. Bonus is a benefit, but it is not extravagant.
