etymologeek.com dictionary
English word infinite comes from Latin finitus (finite, finished), which itself derives from Latin finus (end), combined with the prefix -in (un, not, non-).

Infinite etymology history?

Infinite detailed word origin explanation

Dictionary entryLanguageDefinition
fine Latin (lat) ablative singular of fīnis, which means an end, limit, boundary
-itus Latin (lat)
finitus Latin (lat)
in Latin (lat) prefix, meaning un-, non-, not
infinitus Latin (lat) Boundless, unlimited, endless. Infinite.
infinite English (eng) Infinitely many. (grammar) Not limited by person or number. [from 19th c.]. (mathematics) Greater than any positive quantity or magnitude; limitless. [from 17th c.]. (music) Capable of endless repetition; said of certain forms of the canon, also called perpetual fugues, constructed so that their ends lead to their beginnings.. (set theory, of a set) Having infinitely many elements.. [...]

Words with the same origin as infinite

Descendants of finitus
anatomy fin finance financial fine finesse infinity super
Descendants of -itus
appetite cab cabbie cigarette exquisite favourite reunite unit unite