1. 坚硬的：flintlock 燧发枪 | flinty 坚硬的 | flip horizintal 水平翻转

2. 坚硬的/冷酷的/含燧石的：flintlock /燧石发火装置/燧发枪/ | flinty /坚硬的/冷酷的/含燧石的/ | flip /轻弹/

3. 含燧石的：flintlock 燧石发火装置 | flinty 含燧石的 | flip-flop 正反器

4. 坚硬的,强硬的：fault gouge 断层泥 | flinty 坚硬的,强硬的 | streaky 有斑点的, 有条纹的, 容易变的

1. 冷酷的;冰冷的;铁石心肠的
If you describe a person or someone's character or expression as flinty, you mean they are harsh and show no emotion.

e.g. ...her flinty stare.
她冷峻的目光
e.g. ...a man of flinty determination.
异常决绝的男人

adj

1. showing unfeeling resistance to tender feelings

e.g. his flinty gaze
the child's misery would move even the most obdurate heart

Synonym: flintgraniticobduratestony

2. containing flint