na-adjective, noun
very few; very little; scant
Formal or literary term used to emphasize a small quantity or number. Often appears in written language or formal speech.
この問題に関する情報は鮮少だ。
Information on this issue is very scarce.
鮮少な資源を有効に使わなければならない。
We must make effective use of the scant resources.
Compound of 鮮 (fresh, clear, vivid) and 少 (few, little). The exact historical derivation is uncertain, but the combination conveys the idea of something being strikingly scarce.