"Walking straight and narrow" is a phrase used to describe someone who is living their life in a moral and ethical way. However, there are several synonyms that can be used to convey the same idea. These include "living a righteous life", "walking the path of righteousness", "upholding moral integrity", "following a moral compass", "living a virtuous life", and "staying on the right path". All of these expressions communicate the idea of living a life of honesty, integrity, and moral uprightness. Whether speaking about personal conduct, business practices, or social interactions, using these synonyms can help to add emphasis and clarity to the concept of "walking straight and narrow".