particle
Attaches to the -masu stem of a verb. Describes two actions occurring simultaneously, often with a literary or formal tone. Also used in the pattern つつある to indicate an ongoing change or process.
See also: つつある
彼は働きつつ学校に通っている。
He attends school while working.
状況は改善されつつある。
The situation is gradually improving.
particle
Often used in the pattern つつも. Expresses a contrast between an expected outcome and the actual situation, similar to ながらも but more literary.
See also: つつも
悪いと知りつつ、嘘をついてしまった。
Even though I knew it was wrong, I ended up telling a lie.
彼は体調が悪いつつも、会議に出席し
Despite feeling unwell, he attended the meeting.