noun
deep contemplation; rumination; careful pondering
Literary term for quiet, introspective thought; often implies a meditative or melancholic depth. Not an everyday word; more common in written or poetic contexts.
彼は庭を眺めながら幽思にふけっていた。
He was lost in deep contemplation while gazing at the garden.
この詩には作者の幽思がにじみ出ている。
The poet's quiet rumination seeps through this verse.
Compound of 幽 (yū, 'deep, quiet, hidden') and 思 (shi, 'thought'). The exact historical derivation is uncertain, but the word is used in classical and literary Japanese to denote profound, often melancholic contemplation.