inferior talent; mediocre ability
Refers to a person's lack of talent or ability, often used self-deprecatingly or to describe someone's limited skills. Somewhat formal and not extremely common in casual speech.
He lamented his own lack of talent.
Though I have little talent, I want to at least keep making an effort.
Compound of 劣 (retsu, 'inferior') and 才 (sai, 'talent, ability'). The exact historical derivation is uncertain, but the meaning is transparent from its components.