falter
     n : the act of pausing uncertainly; "there was a hesitation in
         his speech" [syn: {hesitation}, {waver}, {faltering}]
     v 1: be unsure or weak; "Their enthusiasm is faltering" [syn: {waver}]
     2: move hesitatingly, as if about to give way [syn: {waver}]
     3: walk unsteadily; "The drunk man stumbled about" [syn: {stumble},
         {bumble}]
     4: speak haltingly; "The speaker faltered when he saw his
        opponent enter the room" [syn: {bumble}, {stutter}, {stammer}]
Source: WordNet® 2.0