inferiority, be inferior to, be worse

この製品の品質は競合他社に劣っている。

This product's quality is inferior to that of competitors.

彼の英語能力は姉に劣らず優秀だ。

His English ability is excellent and no way inferior to his older sister's.

予算の制約により、今年の事業計画は去年に劣るものになった。

Due to budget constraints, this year's business plan turned out to be less ambitious than last year's.