i Register
In some senses, sixth-rate is marked as UK, historical, idiomatic. Watch for register when choosing this word.
sixth-rate
adj 2noun 1
Definitions
adj
1
Of a Royal Navy warship in the Napoleonic Era: having 20–28 guns on one gun deck, a complement of 140–200, and weighing 340–550 tons burthen.
The Navy classified warships by their number of cannons, and with twenty-eight, she was a sixth-rate–the lowest rank.
2
Terrible, awful; less than fifth-rate.
noun
1
A sixth-rate warship.
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