The actress did not detail any personal issues but added: “When I’m ready, I’ll say what I have to say… stay tuned.”
Uma Thurman’s message wished a happy Thanksgiving to everyone “except you Harvey and all your wicked conspirators”.
“I’m glad it’s going slowly – you don’t deserve a bullet,” she added.
The 65-year-old Hollywood producer denies all allegations of non-consensual acts.
Writing on Instagram, Uma Thurman said she had “a few reasons” to be angry.
She added: “#metoo in case you couldn’t tell by the look on my face.”
The hashtag has been used by women to share stories of harassment and assault.
She also said: “I feel it’s important to take your time, be fair, be exact.
“Stay tuned.”
In an earlier interview, Uma Thurman said it was commendable that women were speaking out about harassment and assault.
“I have learned, I am not a child and I have learned that… when I’ve spoken in anger, I usually regret the way I express myself,” she said.
“So I’ve been waiting to feel less angry. And when I’m ready, I’ll say what I have to say.”
Uma Thurman has appeared in a number of movies that were produced by Harvey Weinstein, including Pulp Fiction and Kill Bill.
Dozens of actresses, including Asia Argento, Angelina Jolie, Gwyneth Paltrow, Rose McGowan and Cara Delevingne have accused Harvey Weinstein of harassment or assault.
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