Definition of hardheads in English:

hardheads

Syllabification: hard·heads
Pronunciation: /ˈhärd(h)edz
 
/

noun

[treated as singular]
Another term for knapweed, especially the black knapweed.

Definition of hardheads in:

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Word of the day flippant
Pronunciation: ˈflipənt
adjective
not showing a serious or respectful attitude