The word "hundred-and-fortieth" refers to the ordinal number which comes after one hundred and thirty-nine. Some antonyms for the word may include terms such as "first," "second," "third," and so on, which count upwards from one. Other antonyms may include terms such as "last," "final," and "ultimate," which suggest the finality of a series or list. Additionally, the word "hundred-and-fortieth" may be considered an adjective or descriptor for a numbered position, in which case antonyms might include descriptors such as "common," "typical," "average," or "unremarkable.