" Almost all people answer that the opposite of "fragile" is "robust", "resilient", "solid", or something of the sort. But the resilient, robust (and company) items that neither break nor improve, so you would not need to write anything on them--have you ever seen a package with "robust" in thick green letters stamped on it? Logically, the exact opposite of a "fragile" parcel would be a package on which one has written "please mishandle" or "please handle carelessly". "

― Nassim Nicholas Taleb , Antifragile: Things That Gain from Disorder