This is the 9732nd most frequent Japanese word.
落ちつい
"落ちつい" is not a complete word, but if you mean "落ち着く" (ochitsuku), it means "to calm down" or "to settle."
In this sentence, '落ち着いた' is used as an adjective to describe a setting or environment that exudes calmness and tranquility.
今日は落ち着いた雰囲気ですね。
Today, the atmosphere feels calm.
Here, '落ち着く' is used to express a personal feeling of calmness or relaxation when in a particular space, such as one's home.
わたしは落ち着く家でリラックスします。
I relax in a home that feels calm.
In this example, '落ち着かせる' acts as a causative form meaning to bring or make oneself or another party calm, often through deliberate effort.