ill ill /ˈɪl/

adjective

1. () Affected by an impairment of normal physical or mental function  ( ill , sick )
   affected by an impairment of normal physical or mental function
    Ill from the monotony of his suffering
   ill from the monotony of his suffering
   
2. () Distressing  ( ill )
   distressing
    Ill manners
   ill manners
    Of ill repute
   of ill repute
   
3. () Resulting in suffering or adversity  ( ill )
   resulting in suffering or adversity
    Ill effects
   ill effects
    It's an ill wind that blows no good
   it's an ill wind that blows no good
   
4. Presaging ill fortune  ( ill , inauspicious , ominous )
   presaging ill fortune
    Ill omens
   ill omens
    Ill predictions
   ill predictions
    My words with inauspicious thunderings shook heaven
   my words with inauspicious thunderings shook heaven
    A dead and ominous silence prevailed
   a dead and ominous silence prevailed
    A by-election at a time highly unpropitious for the Government
   a by-election at a time highly unpropitious for the Government
   
5. Indicating hostility or enmity  ( ill )
   indicating hostility or enmity
    You certainly did me an ill turn
   you certainly did me an ill turn
    Ill feelings
   ill feelings
    Ill will
   ill will
   

adverb

1. () (ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well  ( ill , badly , poorly )
   (ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well
    He was ill prepared
   he was ill prepared
    It ill befits a man to betray old friends
   it ill befits a man to betray old friends
    The car runs badly
   the car runs badly
    He performed badly on the exam
   he performed badly on the exam
    The team played poorly
   the team played poorly
    Ill-fitting clothes
   ill-fitting clothes
    An ill-conceived plan
   an ill-conceived plan
   
2. With difficulty or inconvenience; scarcely or hardly  ( ill )
   with difficulty or inconvenience; scarcely or hardly
    We can ill afford to buy a new car just now
   we can ill afford to buy a new car just now
   
3. Unfavorably or with disapproval  ( badly , ill )
   unfavorably or with disapproval
    Tried not to speak ill of the dead
   tried not to speak ill of the dead
    Thought badly of him for his lack of concern
   thought badly of him for his lack of concern
   

noun

1. An often persistent bodily disorder or disease; a cause for complaining  ( ill , complaint , ailment )
   an often persistent bodily disorder or disease; a cause for complaining
     The herbal tea provided relief for her stomach ailment.
   The herbal tea provided relief for her stomach ailment.