And then, although you've allowed me to use all your stuff, I hardly think I can touch your computer and the CD player.

hardly 是副词，意思是"几乎不"，表示程度非常低或接近否定。这个词由 hard（困难的、坚硬的）加后缀 -ly 构成，但意思与 hard 不同，表示"几乎不"或"几乎没有"的否定含义。