By Michelle Martin and Kirsti Knolle FRANKFURT (Reuters) - The mood among analysts and investors in Europe's largest economy took a sharply pessimistic turn in June, with a sentiment indicator dropping to a seven-month low as the Greek crisis and subdued global growth frayed nerves. Mannheim-based think tank ZEW said on Tuesday its monthly survey of German economic sentiment fell to 31.5 points from 41.9 in May, undershooting a Reuters consensus forecast of 37.1. "June's sharp fall in ZEW investor sentiment suggests that the German recovery is suffering from fears about the impact of the Greek crisis," said Jennifer McKeown, senior European economist at Capital Economics.