falter
noun.
the act of pausing uncertainly
there was a hesitation in his speech
verb.
be unsure or weak
Their enthusiasm is faltering
Synonym: waver
verb.
move hesitatingly, as if about to give way
Synonym: waver
verb.
walk unsteadily
The drunk man stumbled about
Synonym: bumble, stumble
verb.
speak haltingly
The speaker faltered when he saw his opponent enter the room