Hesitation
Part of speech: noun
Definition: An act of hesitating; suspension of opinion or action; doubt; vacillation. A faltering in speech; stammering.
Example sentence: To teach how to live without certainty and yet without being paralysed by hesitation is perhaps the chief thing that philosophy, in our age, can do for those who study it.
Faltering
Part of speech: verb
Definition: To waver or be unsteady; to weaken or trail off.