Want to say should have differently? Here are other words for should have and its similar synonyms and opposite words to say in unique way.
Meaning of should have
The primary meaning of "should have" is to express a past obligation or expectation that was not fulfilled.
Etymology of should have
The word "should" is derived from the Old English word "sceolde," which is the past tense of "sceal," meaning "to owe" or "to be under obligation"
   The word "have" is derived from the Old English word "habban," meaning "to hold" or "to possess"
   The phrase "should have" has been in use since the 15th century to express a past obligation or expectation
Synonyms
                                                ought to
                                                                        must
                                                                        need to
                                                                        have to
                                                                        are to
                                                                        were to
                                                                        will have to
                                                                        can have
                                                                        may have
                                                                        might have
                                                                        could have
                                                                        would have
                                                                        should
                                                                        must have
                                                                        had to
                                                                        supposed to
                                                                        expected to
                                                                        required to
                                                                        necessary to
                                                                        compelled to
                                                                        bound to
                                                                        destined to
                                                                        fated to
                                                                        meant to
                                                                        intended to
                                                                        designed to
                                                                        planned to
                                                                        scheduled to
                                                                        set to
                                                                        purposed to
                                                                        predetermined to
                                                                        predestined to
                                                                        foreordained to
                                                            
            Definitions
- Used to express a past obligation or expectation that was not fulfilled
- * Used to express a past condition that did not occur
- * Used to express regret or disappointment about something that did not happen
Usage Examples
- I should have studied harder for the exam
- * She should have taken the job offer
- * They should have arrived earlier to avoid the traffic
Antonyms
                                                didn't need to
                                                                        wasn't supposed to
                                                                        didn't have to
                                                                        ought not to
                                                                        mustn't
                                                                        shouldn't
                                                                        wasn't meant to
                                                                        didn't intend to
                                                                        hadn't planned to
                                                                        wasn't required to
                                                                        wasn't necessary to
                                                                        didn't expect to
                                                                        wasn't destined to
                                                                        wasn't fated to
                                                                        wasn't compelled to
                                                                        wasn't bound to
                                                                        wasn't required to
                                                                        wasn't obliged to