under the weather

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

somewhat ill or prone to illness
- my poor ailing grandmother
- feeling a bit indisposed today
- you look a little peaked
- feeling poorly
- a sickly child
- is unwell and can't come to work
• Syn:
ailing, indisposed, peaked, poorly, sickly,
unwell, seedy
• Similar to:
ill, sick
• Derivationally related forms:
unwellness (for: unwell)