sure (adj.) 2
harmless, innocuous, unable to cause damage
1H4 V.iii.47 [Falstaff to Prince Hal] I have paid Percy, I have made him sure
Per I.i.168 [Thaliard to Antiochus, of Pericles] I'll make him sure enough
Tit II.iii.133 [Chiron to Tamora, of silencing Lavinia] we will make that sure
Tit II.iii.187 [Tamora to Demetrius and Chiron, of Lavinia] See that you make her sure