1. (adverb) extremely and sharply

• bitingly
• bitter
• piercingly

1. (adverb) with bitterness, in a resentful manner

• acrimonious
• bitter

2. (adverb) indicating something hard to accept

• bitter

3. (adverb) extremely and sharply

• biting
• biting
• bitter
• bitter
• cutting
• keen
• knifelike
• lancinate
• lancinating
• piercing
• stabbing