Humming and haw is a phrase that refers to the action of hesitating or being indecisive. There are several synonyms that can be used instead of humming and haw, such as dithering, vacillating, wavering, stalling, procrastinating, and delaying. These words all refer to the act of delaying decision-making, either intentionally or due to indecisiveness. Synonyms such as equivocating, fence-sitting, and sitting on the fence can also be used to describe someone who is undecided or hesitant. Overall, these synonyms all convey a sense of uncertainty and delay in making a choice or taking action.