This is the 5853rd most frequent Japanese word.
ふりむき
Turning around; looking back.
ふりむいた is the past form of ふりむく ('to turn around'), describing an action performed by the subject.
彼は声をかけられてふりむいた。
He turned around when someone called out to him.
ふりむきざま combines ふりむき ('turning around') with ざま ('moment'), emphasizing the instance while turning.
その少女はふりむきざまに微笑んだ。
The girl smiled as she turned around.
ふりむかず is a negative form of ふりむく ('to turn around'), indicating an action not performed.