I'm gonna be the annoying "AAActually" guy here and point out that the term liquid can include many substances that are far more viscous than even peanut butter, to the point of appearing solid.

There's a whole ongoing experiment where a form of naturally occuring asphalt has been left to drip, it has only done so 9 times since 1930 and is for this reason still considered a liquid despite seeming so solid at room temp it can be shattered with a forceful enough blow.