Simple past tense and past participle of falter.(verb)
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Use "faltered" in a sentence
"Delphine broke into an ecstatic smile, as if she had just seen God, but her expression faltered when Serge looked right through us, and when he passed our table without a glance, Delphine’s eyes took on a sheen of such naked despair that I found myself thinking irritably that, in love or no, she really was overdoing it."
"The reason countries like Japan and Mexico have faltered is because the people of Japan and Mexico have not made the tough choices, like Americans and Australians have done, to restructure their economy."
"Meanwhile, New York again faltered when it mattered."