1710 Ld. Shaftesbury 93 The florid and over-sanguine Humour of the high Stile was allay'd by something of a contrary nature.
1869 M. Arnold iii. 136 This certainly does appear over-sanguine.
1937 ‘M. Innes’ iii. i. 213 There had been spies..and one of them had doubtless sent away an over-sanguine message.