vacillate /ˈvasɪleɪt 
, ˈvasɪlət / ▸ verb [no object] waver between different opinions or actions; be indecisive: I vacillated between teaching and journalism.
– ORIGIN late 16th century (in the sense ‘sway unsteadily’): from Latin vacillat- ‘swayed’, from the verb vacillare.
EnglishOxford Dictionary of English
