efficacy –n. the power to produce the desired result or effect

intention –n. the thing that you plan to do; the goal or aim of some action

deliberately –adv. done in a way that is meant or planned

hesitancy –n. slow to act or speak especially because of being unsure

inflammation –n. a condition when part of the body becomes red, bigger and more sensitive

dose –n. the amount of a medicine or vaccine that is taken at one time

impression –n. the effect or influence that something or someone has on a person's thoughts or feelings

confidence –n. a feeling of being sure that something is true or will happen in an expected way

authorize –v. to give legal or official approval