The grammar structure ながらも expresses concession – meaning "although," "despite," or "even though." It indicates that despite one condition being true, something unexpected or contrasting also holds. It combines ながら (while) with the particle も (even/also), creating the nuance of "even while being ~."
While ながら on its own typically describes two simultaneous actions (e.g., "while eating"), ながらも shifts the meaning to contrast or concession. The focus is not on doing two things at the same time, but on the fact that something is true despite something else.
ながらも attaches to different word types:
Verb[ます-stem] + ながらも: The verb stem form is used.
い-adjective + ながらも: Attach directly to the い-adjective.
な-adjective (stem) + ながらも: Use the stem without な or だ.
Noun + ながらも: Attach directly to the noun.
ながらも carries a somewhat literary or formal tone compared to casual alternatives like のに or けど. It is common in written Japanese, speeches, and more formal conversation. It emphasizes the speaker's recognition that the two states coexist in a surprising or noteworthy way.