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Difference between Swell-head and Thick-head

swell-head—(coll.)

1. self-conceit:

  • Lord, but young Gourlay was the fine fellow! Symptoms of swell-head set in with alarming rapidity.

2. a conceited person:

  • As for the present directory, they’re all a pack of damned swell-heads.

thick-head—(coll.) smb. who is dull of intellect:

  • I wasn’t very good at school and left supremely unqualified for anything and totally convinced I was a thickhead.