〜ながら(も) (although)
although, even though
Verb ます-stem / い-adj / Noun + ながら(も)
Sign up free to review this point on a spaced schedule.
At N5, ながら meant doing two things at once. With states, it means "although": 狭いながらも、快適な部屋だ, "it's small, but it's a comfortable room". The も is optional and adds emphasis.
It attaches to a ます-stem (知っていながら), an い-adjective (狭いながら), a noun (子どもながら) or a な-adjective stem (残念ながら).
The feeling is "despite that": 知っていながら、何も言わなかった, "even though I knew, I said nothing". It often admits something awkward.
Set phrases: 残念ながら, "unfortunately"; 勝手ながら, "we apologise, but" (on shop notices); 陰ながら, "from the sidelines". Context tells you which ながら you're reading: an action verb means "while", a state means "although".
Examples
狭いながらも、快適な部屋だ。
It's small, but it's a comfortable room.
知っていながら、何も言わなかった。
Even though I knew, I didn't say anything.
残念ながら、今回は参加できません。
Unfortunately, I can't take part this time.
子どもながら、よく頑張った。
Although just a child, they did very well.
体に悪いと分かっていながら、たばこをやめられない。
Even though I know it's bad for me, I can't quit smoking.