Not very: 不太
不太 + adjective is the soft, polite "not very": 不太冷 "not very cold", 不太好 "not great". Chinese speakers lean on it constantly to say something negative without sounding harsh — 我不太喜欢 "I don't really like it" is much gentler than a flat 我不喜欢.
Don't mix it up with 太…了: 太冷了 "too cold!" is an exclamation, while 不太冷 is calm and takes no 了. And 很不冷 is a different thing altogether — 很不 means "very NOT", the opposite of soft.
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Related grammar points
See it in a story
Read this pattern in context: The First Package of the Day (Part 1) · A Lost Afternoon (Part 2) · An Engineer's Morning (Part 1) — free graded stories with tap-to-reveal pinyin and translations.
