The word racism has been stretched until it has become porous.

Something he must utter, like a spell, to make the wall become porous?

The computers that tie together the Government's information systems have become increasingly porous.

Granted, in the information economy, the border between growth and value stocks has inevitably become more porous.

Moreover, the border separating the urban center from the first ring has become porous.

The structure has become porous and I fear that the wall of the shower, which forms part of the living room, will cave in.

And why has what one official called its "moral shield" become so porous?

It has become porous and its tensile strength is greatly reduced.

Boundaries between the real and the unreal become porous.

Borders have become porous: the portfolio companies derive at least 40 percent of their sales or income overseas.