Related Clues:

• Not sensible or prudent
• Lacking sound judgement, maybe foolish
• Not reliable, like some evidence
• Not strong or free from defect - perhaps evidence in court
• Unfit or unreliable
• Spoil this and it gives the impression of being mischievous.
• 24 down?
• It's not safe for it to be silent
• Can't 5 down to what is so shaky, perhaps
• You can't depend on its being so silent, perhaps
• Easy to break the silence if it's like this, perhaps
• There's nothing between sun and dun to make it seem so silent
• Weak conciliators must get a report
• Dodgy
• Not prudent