Collocations for ill - adj.

be, feel, look | become, be taken, fall, get | make sb
I can''t eat bananas. They make me ill.

critically, dangerously, desperately, extremely, gravely, really, seriously, severely, terribly, very
His mother is seriously ill in hospital.

almost
Robyn was almost ill with excitement and outrage.

pretty, quite, rather, slightly | genuinely | violently
She was taken violently ill and had to be put to bed.

acutely | chronically
chronically ill patients

fatally, incurably, mortally, terminally
a hospice for the terminally ill

mentally, physically
the problems faced by mentally ill people