The blast proved harmless to the two-dimensionals; deadly to the Whole.
The office was evacuated for 30 minutes, but the substance, tested by a team of specialists, proved harmless.
"His efforts, I assure you, will prove very harmless."
I inquired into that because of the security angle but Guinness proved harmless.
If heroin use proves relatively harmless to all concerned then we should advocate legal reform and controlled availability.
When they first showed up there was considerable alarm about them, but so far they have proven harmless.
Some crossbow-bolts were shot, but at extreme range these proved harmless.
A loud argument on the street proves ultimately harmless.
Such type of beliefs (geosentiments) may prove harmless or harmful, depending on circumstances.
Like the Mets, however, the sky proved harmless as no rain fell during the game.