The Japanese onomatopoeia しくしく (shikushiku), describing soft weeping, derives its evocative power from reduplication, a common linguistic device in Japanese. Repeating the initial syllable, "shiku," amplifies the core meaning. This duplication creates a sense of continuous or repetitive action, reflecting the sustained nature of sobbing.

The morphemic composition of "shiku" itself contributes significantly to the onomatopoeia's emotional impact. Though its origin is difficult to pinpoint precisely, the "shi-" sound, especially when combined with a 'k' sound, can be perceived as an almost instinctive representation of involuntary actions or subtle, contained expressions. This phonaesthetic quality supports the idea that しくしく evokes a delicate, somewhat restrained weeping, contrasting with louder, more demonstrative cries.

While しくしく's specific form might not appear as a standalone word in classical texts, the sentiment it expresses—sadness, loss, sorrow—is a timeless theme. The spirit of しくしく resonates with the overall aesthetic of mono no aware (物の哀れ)—the pathos of things—which permeated the classical era. The early Japanese literature is full of examples of the themes expressed in modern-day しくしく. For instance, in The Tale of Genji (源氏物語), written in the early 11th century, subtle expressions of grief and loss are constantly woven throughout the narrative and the onomatopoeia embodies the same sensibility of quiet sorrow.

The onomatopoeic usage of しくしく has to do with how the Japanese language makes use of sound symbolism. The use of 'k' adds a layer of quiet tension to the sound. This differs somewhat from other words. This contrasts with, for example, a softer sound such as "shii shii" (シイシイ), which implies an almost wind-like sound, as can be heard in the Edo Haiku poets, such as Basho, who used onomatopoeia frequently.