minuscule

她的笔迹非常小，几乎难以辨认。

Her handwriting is so ___minuscule that it's almost illegible.

显微镜下才能看到这些极微小的细菌。

These ___minuscule bacteria can only be seen under a microscope.

这些细节上的差异对我们的决策影响极小。

The differences in these details have a ___minuscule impact on our decision.