1. 紧嘴的：closelytightly 紧紧 | closemouthed 紧嘴的 | closer 更近的

2. 寡言的/沉默的/紧嘴的：closefisted /吝啬的/小气的/ | closemouthed /寡言的/沉默的/紧嘴的/ | closeness /密闭/

3. 沉默寡言的, 嘴紧的：closely || 接近地 | closemouthed || ,沉默寡言的, 嘴紧的 | closeness || 紧闭, 狭窄

4. 沉默的; 口紧的 (形)：closely 接近地 (副) | closemouthed 沉默的; 口紧的 (形) | closeness 接近; 亲密; 极相似; 严密 (名)

adj

1. inclined to secrecy or reticence about divulging information

e.g. although they knew her whereabouts her friends kept close about it

Synonym: closecloselippedsecretivetightlipped