1. somewhat bitter in taste; having a mild or slight bitter flavor
Usage: informal; often used to describe foods or beverages with a noticeable but not overwhelming bitter quality
2. somewhat bitter in feeling, tone, or manner; mildly resentful or acrimonious
Usage: informal; describes emotions or attitudes that are tinged with bitterness but not intensely so

Examples

• The coffee had a bitterish aftertaste that lingered on her tongue.
• His bitterish remarks about the situation revealed his underlying disappointment.
• The dark chocolate was bitterish rather than sweet, appealing to mature palates.
• She gave a bitterish laugh when recalling the failed project.
• The medicine tasted bitterish but was tolerable with water.
• His tone was bitterish as he congratulated the winner.