na-adjective, noun which may take the genitive case particle 'no'
very little; very few; scanty; paltry
Literary or formal word for an extremely small amount or number. Often used in written descriptions of resources, evidence, or results. In speech, ごくわずか or ほんの少し are more natural.
その計画に割り当てられた予算は寡少だった。
The budget allocated to the project was exceedingly small.
この地域の降水量は寡少で、農業には厳しい。
Rainfall in this region is scanty, making farming difficult.