Seems to imply leaving it unsaid rather than to
cause offence.
Hann lét það ógert. = He refrained from doing
it.
likewise seems to imply an action left simply
because the person mentioned knew darned well it was unworthy of his
participation, better for him to leave someone else to do it and get the
blame.
As I say Grace, that's just my two pence unless
we are using Norse Currency in which case my two kronar