The displacement of populations is one of the gravest consequences of today's armed conflicts. Despite all the concern over these military threats, the weather presented the gravest danger. In Muslim societies, insulting Muhammad is considered one of the gravest of all crimes. A whole life tariff may be imposed for the gravest offences. He still had the gravest doubts that transmutation would bestialise man. Substantial groundwater contamination is one of the gravest environmental impacts caused by Chernobyl disaster. Trial by ordeal is used by the Bedouin to decide on the gravest of crimes. By the Opposition rank and file the gravest accusations were raised against Andrassy. Kuchma later regretted Lazarenko's appointment as "my gravest mistake". This is the gravest hour of our history. The gravest incident that day was a direct hit on a primary school in Poplar.