Of persons or their behaviour: marked by or reflective of undesirably limited interests, sympathies, or views; begrudging, selfish, small-minded; also, preoccupied with subjects having little or no importance and not mindful of broader concerns.

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Sense（3）

(historical) Of or relating to the lowest grade or level of school; junior, primary.

Friends are separated for long portions of time even while they live; at last they take their leave for ever: although, I remember, when you left me in the petty form at Westminster, I soon afterwards found you in a higher remove: and this world is only the petty form of the universe; so I not only expect to pass a social hour with you here, but am in hopes of a merry meeting in a better place; […]

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Sense（4）

Little or small in size.

To morrow, and to morrow, and to morrow, / Creepes in this petty pace from day to day, / To the laſt Syllable of Recorded time: / And all our yeſterdayes, haue lighted Fooles / The way to duſty death.

Google Translation / DeepL Translation