hard-head noun. ['hɑ:dhɛd] Also (esp. in sense 3) hardhead. E16.
[from HARD adjective + HEAD noun. In branch II alt. of some word of unkn. origin.]
I.
1. A hard-headed person, esp. someone who is practical and unsentimental. Also, a stupid person. E16.
b. A person not easily affected by alcohol. M19.

2. A contest of head-butting. L17-M19.

3. sing. & in pl. A tough-stemmed kind of knapweed, Centaurea nigra, common in grassland, with heads of dense purple florets. L18.

4. Any of various fishes said to have hard heads; spec. (Scot.) the father-lasher, Myoxocephalus scorpius. E19.

[TahlilGaran] English Dictionary ▲

hard head
II.

5. A Scottish copper coin of Mary and James VI of Scotland worth about three halfpence of English money. Long obsolete exc. Hist. M16.

[TahlilGaran] English Dictionary ▲