Describes something very small-scale, especially businesses, industries, or amounts. Often used in economic contexts like 零細企業 (tiny enterprise) or 零細農家 (small-scale farmer).
There are many tiny enterprises in this area.
彼は零細な収入で家族を養っている。
He supports his family on a paltry income.
He runs a tiny factory.
Farming in this region is very small-scale.