〜ものの
although, but
Plain form + ものの (な-adj + な / である)
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ものの admits the first part is true, then adds that the expected result didn't follow: 日本に来たものの、まだ一度も富士山を見ていない, "I've come to Japan, but I still haven't seen Mount Fuji".
It's a formal, written "although", often with a sense of things falling short: buying something and never using it, taking medicine and not getting better, understanding something but not being able to do it.
It follows a plain form, most often a past one. な-adjectives take な or である.
It's calmer than のに, which complains, and more formal than けど. Don't confuse it with もので ("because") or ものなら ("if only").
Examples
日本に来たものの、まだ一度も富士山を見ていない。
I've come to Japan, but I still haven't seen Mount Fuji even once.
薬を飲んだものの、全然よくならない。
I took the medicine, but I'm not getting any better.
買ったものの、一度も使っていない。
I bought it, but I haven't used it once.
頭ではわかっているものの、なかなか実行できない。
I understand it in my head, but I just can't put it into practice.
約束はしたものの、行きたくない。
I did promise, but I don't want to go.