ill- - inef
- ill-behaved function
- ill-conditioned
- ill-conditioned equation
- ill-conditioned matrix
- ill-conditioned problem
- ill-conditioning
- ill-defined function
- ill-defined problem
- ill-definedness
- ill-formed
- ill-posed problem
- ill-posedness
- ill-structured
- illegal
- illegal access
- illegal character
- illegal code
- illegal command
- illegal control-message error
- illegal digit
