| Play | Key Line | Modern Text | Original Text |
| All's Well That Ends Well | AW V.iii.205 | He's quoted for a most perfidious slave | He's quoted for a most perfidious slaue |
| Coriolanus | Cor V.vi.91 | You lords and heads o'th' state, perfidiously | You Lords and Heads a'th' State, perfidiously |
| Henry VIII | H8 I.ii.156 | Men feared the French would prove perfidious, | Men feare the French would proue perfidious |
| The Tempest | Tem I.ii.68 | Be so perfidious! – he, whom next thyself | Be so perfidious: he, whom next thy selfe |
| The Tempest | Tem II.ii.147 | By this light, a most perfidious and drunken | By this light, a most perfidious, and drunken |
| The Two Noble Kinsmen | TNK III.i.35 | A confessed traitor, O thou most perfidious | A confest Traytor, o thou most persidious |