From WordNet (r) 3.0 (2006):
falter
n 1: the act of pausing uncertainly; "there was a hesitation in
his speech" [syn: hesitation, waver, falter,
faltering]
v 1: be unsure or weak; "Their enthusiasm is faltering" [syn:
falter, waver]
2: move hesitatingly, as if about to give way [syn: falter,
waver]
3: walk unsteadily; "The drunk man stumbled about" [syn:
stumble, falter, bumble]
4: speak haltingly; "The speaker faltered when he saw his
opponent enter the room" [syn: bumble, stutter,
stammer, falter]