hesitate

Synonyms: alternate balance balk be irresolute be reluctant be unwilling blow hot and cold dally debate defer delay demur dillydally dither doubt equivocate falter flounder fluctuate fumble hang hang back hedge hem and haw hold back hold off hover linger oscillate pause ponder pull back pussyfoot scruple seesaw shift shrink shy away sit on fence stammer stop straddle stumble stutter swerve tergiversate think about think twice vacillate waffle waver weigh

Antonyms: attack carry on continue go go ahead persevere resolve