Thyself/ðaɪˈself/ Definition 1 of 1Pro Tip 1/3Archaic Usage Used in very old literature or poetry, not common in everyday modern English. Respect thyself and thy ancient lineage. Pro Tip 2/3Personal Reflection Often found in contexts encouraging self-awareness or self-improvement. Seek to know thyself and thy true desires. Pro Tip 3/3Emotional Weight Gives a sense of depth or seriousness when used, due to historical and literary associations. Bear thyself with dignity and grace under pressure.