hesitant and not daring to move forward
...胆大包天 full of noble aspiration and daring 气贯长虹; 气贯长虹 hesitant and not daring to move forward (idiom) 趑趄不前 ..
趑趄(zī jū):迟疑不敢前进。形容犹豫畏缩不敢前进。