na-adjective
ephemeral; transitory; fleeting
Describes something that lasts only a moment, often with a poetic or philosophical nuance. Used for experiences, pleasures, or states that are brief and passing.
人生の喜びは刹那的なものだ。
The joys of life are ephemeral.
彼は刹那的な快楽を追い求めた。
He pursued fleeting pleasures.
一時的 means 'temporary' in a more neutral, practical sense, while 刹那的 carries a stronger nuance of brevity and often a poetic or philosophical tone.
Derived from the Buddhist term 刹那 (setsuna), meaning an extremely short moment, combined with the adjectival suffix 的 (teki).