Used to indicate 'even with this' or 'despite this' — expresses contrast, emphasis, or surprise (often in patterns like 'これでもまだ〜').
これでもまだ足りない。
Even with this, it's still not enough.
彼はこれでも頑張ったつもりだと言った。
He said that he thought he had tried his best, even so.
天気は悪いが、これでも散歩に行くつもりだ。
The weather is bad, but even so I plan to go for a walk.