Question

lasting for a very short time\
benevolent\
eradicate\
aesthetic\
ephemeral

Explanation:

• "Benevolent" means kind or charitable, not short-lasting.
• "Eradicate" means to destroy completely, it is a verb, not an adjective describing duration.
• "Aesthetic" refers to beauty or taste, unrelated to time length.
• "Ephemeral" is defined as lasting for a very short period.

Answer:

Ephemeral