Her glare suggested she was the worst thing that had ever happened to the school.

glare 是名词，指"怒视、瞪眼"，表示强烈的不满或愤怒情绪。这个词来自动词 glare（怒目而视），描述一种用凶狠或威胁的眼神盯着看的行为。在句中暗示她带着充满敌意的目光。