1. 看不见的;隐形的
If you describe something as invisible, you mean that it cannot be seen, for example because it is transparent, hidden, or very small.
e.g. The lines were so finely etched as to be invisible from a distance...
线条被蚀刻得如此精细，在远处看都看不见。
e.g. The belt is invisible even under the thinnest garments.
这种腰带即便在最薄的衣衫下都看不出来。