conscience
I'm finding it hard to continue to drive a petrol car with a clear conscience.
These desserts are great for people watching their weight as you can eat them with a clear conscience.
It's just no longer realistic for us to expect ultra-cheap food and at the same time enjoy clear consciences.

SMART Vocabulary: related words and phrases

Innocent
acquit
acquit someone of something
acquittal
be above/beyond reproachidiom
be in the clearidiom
cleared
come up/out smelling of rosesidiom
culpability
culpably
exculpate
guiltless
guiltlessly
inculpable
innocence
innocency
reproach
self-exculpation
sinless
sinlessly
squeaky-clean