Expressing "although" with "jinguan"

尽管 (jǐnguǎn) means "although", and is a little stronger than 虽然, perhaps more like "even though."

Structure

尽管 A，还是 / 仍然 B

尽管领导今天不来，可我们还是不能偷懒。Even though the leaders aren't coming today, we still can't be lazy.
尽管火很大，很危险，消防员仍然勇敢地冲了进去。Even though the fire was big and it was very dangerous, the firefighters are still bravely running in.
尽管失败了好几次，可他仍然想创业。Even though he's failed many times, he still wants to start a business.
尽管实现这个目标不太容易，但是我们不能这么快就放弃。Even though it's not that easy to realize this goal, we can't just give up on it.
尽管没人赞同他的观点，他还是坚持自己的看法。Even though nobody agreed with him,he still holds to his views.

可 or 却 can be added before 还是 or 仍然 to further emphasize the shift in meaning in the second phrase.