Ulterior

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mid 17th century: from Latin, literally ‘further, more distant’.

wiktionary

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From Latin ulterior(“ further, more distant”), from ulter(“that is beyond”) + -ior(“ more”).

etymonline

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ulterior (adj.)

1640s, "on the other side of," from Latin ulterior "more distant, more remote, farther, on the farther side," comparative of *ulter "beyond" (from suffixed form of PIE root *al- "beyond"). The sense "not at present in view or consideration" (as in ulterior motives) is attested from 1735.