Resembling or characteristic of a bald person; somewhat bald or showing signs of baldness.
From Latin 'calvus' meaning bald, with the English diminutive suffix '-ish' added to suggest a partial or incomplete quality of baldness.
This is one of those wonderfully specific Old English insults—while 'bald' is neutral, 'calvish' has a slightly mocking tone, like describing someone as 'baldish' to suggest they're being vain about their remaining hair.
Complete word intelligence in one call. Free tier — 50 lookups/day.