falter

nouns

the act of pausing uncertainly
"there was a hesitation in his speech"
falter, faltering, hesitation, waver

verbs

be unsure or weak
"Their enthusiasm is faltering"
falter, waver
move hesitatingly, as if about to give way
falter, waver
is derived from
faltering
walk unsteadily
"The drunk man stumbled about"
bumble, falter, stumble
speak haltingly
"The speaker faltered when he saw his opponent enter the room"
bumble, falter, stammer, stutter