“吞吞吐吐”常见的英文表达有 hesitate in speech、be hesitant/reluctant to speak out 或 speak in a hesitant/halting manner，具体可根据语境选择：
hesitate in speech：强调说话时犹豫不决，不流畅。例如：He hesitated in speech, as if he was hiding something.（他说话吞吞吐吐，好像藏着什么秘密。）
be hesitant/reluctant to speak out：侧重于表达内心有顾虑，不太愿意直接、畅快地说出想法。例如：She was hesitant to speak out about her true feelings.（她对于说出自己的真实感受吞吞吐吐，有所顾虑。）
speak in a hesitant/halting manner：直接描述说话的方式是迟疑、不连贯的。例如：He spoke in a hesitant manner, stumbling over his words.（他说话吞吞吐吐，结结巴巴。）