"感觉真不错" 可以用英语表达为 "feels really good" 或 "feels really great"。
"Feels" 是动词，表示"感觉"的意思。"Really" 是副词，表示强调，"good"和"great"都是形容词，表示 "好" 的意思。
例句：
This ice cream tastes really good. (这个冰激凌味道真不错。)
The concert was really great. (音乐会真棒。)
The weather is really nice today. (今天天气真好。)