| fault(noun, trouble, difficulty, weakness, bar) |
| faulty(poor, inadequate, deficient, lacking, incomplete) |
| flawed(inadequate, deficient, incomplete, inexact, wanting) |
| fly in the ointment(noun, expression, idiom, trouble, difficulty) |
| forfeit(confused, out, hidden, lost, missing) |
| forfeited(confused, out, hidden, lost, missing) |
| gone(short, out, hidden, lost, lacking) |
| gone astray(expression, out, hidden, lost, missing) |
| have need of(verb, expression, idiom, phrasal verb, want) |
| hidden(confused, out, lost, unchangeable, missing) |
| hindrance(noun, trouble, difficulty, weakness, bar) |
| hurting for(verb, expression, phrasal verb, want, need) |
| if not(expression, bar, save, failing, lacking) |
| impaired(short, inadequate, deficient, incomplete, inexact) |
| impediment(noun, trouble, difficulty, weakness, bar) |
| imperfection(noun, trouble, difficulty, weakness, bar) |
| importance(lower, mediocre, substandard, secondary, lesser) |
| in debt(expression, idiom, debt, nonpayment) |
| incapable(poor, inadequate, insufficient, deficient, scarce) |
| incommensurate(poor, inadequate, insufficient, deficient, scarce) |