My answer to your question is probably too late. I write it anyhow since someone else might fall for the same trap....
There are two adjectives that look very similar in Romanian
acru = sour - the taste of lemon, vinegar etc
amar = bitter - the taste of grapefruit.
I will put both declinations here beneath. The problem is that if you are coming from a Spanish background you use the word 'acre' for bitter which is conflicting with Romanian...