1. falter, faltering, hesitation, waver

the act of pausing uncertainly

Example Sentences:
'there was a hesitation in his speech'

• faltering
• hesitation
• waver

2. falter, waver

be unsure or weak

Example Sentences:
'Their enthusiasm is faltering'

• waver

3. falter, waver

move hesitatingly, as if about to give way

• waver

4. bumble, falter, stumble

walk unsteadily

Example Sentences:
'The drunk man stumbled about'

• bumble
• stumble

5. bumble, falter, stammer, stutter

speak haltingly

Example Sentences:
'The speaker faltered when he saw his opponent enter the room'

• bumble
• stammer
• stutter