expression, noun which may take the genitive case particle 'no'
trivial; insignificant; that little amount
Expresses that something is too small or insignificant to matter; often used dismissively or to downplay a concern. Functions as a noun-like expression with の or in phrases like それしきのこと.
Don't get angry over such a trivial thing.
If it's that small an amount, you don't need to worry about it.
Kana spelling is standard; usually written in kana.
Kanji form using 式; less common but still encountered.
Rarely used kanji form with 其れ.
Compound of それ (that) and しき (an old suffix meaning 'extent' or 'amount', related to だけ). The exact historical derivation of しき is uncertain, but it functions similarly to だけ or ほど in modern Japanese.