ofttimes

adverb

oft·​times ˈȯf(t)-ˌtīmz 

chiefly literary

: on many occasions : often

Our books of science, as they improve in accuracy, are in danger of losing the freshness and vigor and readiness to appreciate the real laws of Nature, which is a marked merit in the ofttimes false theories of the ancients.

—Henry David Thoreau

Word History

First Known Use

14th century, in the meaning defined above