i Register
In some senses, acidulous is marked as figuratively. Watch for register when choosing this word.
acidulous
UK /əˈsɪdjʊləs/ US /əˈsɪdjʊləs/
adj 3
Definitions
adj
1
Slightly sour; subacid; sourish.
the hard, acidulous, metallic tincture of the spring
2
Sharp; caustic.
He talked with acidulous tolerance of the exalted personages who had sent Ashenden to X.
3
Containing carbonic acid.
acidulous mineral waters
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