oftenest

Adverb

dated form-of superlative

(dated) superlative form of often: most often

Japanese Meaning

古風な用法であり、「often」の最上級（つまり「最も頻繁に」という意味）を表す活用形です。

Among all the cafés in town, the corner bakery is the one I visit oftenest.

町のすべてのカフェの中で、私が最も頻繁に訪れるのは角のベーカリーです。

Sense（1）

(dated) superlative form of often: most often