unwell (adj.)

• ailing
• bad
• down
• faint
• feeble
• frail
• ill
• indisposed
• infirm
• low
• mean
• off-color
• offish
• poorly
• queasy
• rocky
• seedy
• shaky
• sick
• sickish
• sickly
• squeamish
• weakly
• wobbly