expression
Concessive conjunction attaching to the continuative form of verbs, adjectives, or nouns. Emphasizes that the second clause occurs in spite of the first.
彼は若いながらも、とてもしっかりしている。
Though he is young, he is very reliable.
狭いながらも楽しい我が家。
Though it's small, it's a happy home.
expression
while; as; at the same time as
Indicates two actions or states occurring simultaneously, often with a contrastive nuance. Less common than the concessive use.
彼は笑いながらも、目は真剣だった。
While he was laughing, his eyes were serious.