ephemeral, transitory

smile, happy face, smiling face

to disappear, to vanish, (of a fire or light) to go out / to die

an instant / moment

roughly 0.11 seconds, defined as 1/65ᵗʰ of a 弾指 (danshi), where a danshi is 1/12,000ᵗʰ of a day or 7.2 seconds / 0.002 seconds, defined as 1/60ᵗʰ of a 念 (nen), where a nen is 1/60ᵗʰ of a 弾指 (danshi)

traditional folk song of Amami / (more broadly) traditional folk song of Okinawa

To do something completely (unintentionally); cannot help doing

indicates that something undesirable was done or happened

to close / to finish, do something completely / to put away, to put an end to / is, or was (with conjugation), done completely / happens, or happened, unexpectedly / is done with difficulty

used in response to a failure or mistake: dang, shoot, darn it