Non-intrusive synonyms

" I have no veneration," he said to the royal commissioners in St Andrews, before either the voluntary or the non-intrusive controversies had arisen, " for the Church of Scotland qua an establishment, but I have the utmost veneration for it qua an instrument of Christian good."

The search for buried ordnance is carried out using either non-intrusive or intrusive investigation methods.

They have an extensive bag of tricks such as using chimneys to conceal wiring and non-intrusive smoke and intruder alarms.