ILL a.
Not according with rule, fitness, or propriety; incorrect; rude; unpolished; inelegant. That 's an ill phrase. Shak. Ill at ease, uneasy; uncomfortable; anxious. "I am very ill at ease." Shak. -- Ill blood, enmity; resentment. -- Ill breeding, want of good breeding; rudeness. -- Ill fame, ill or bad repute; as, a ho…
ILLEGAL a.
Not according to, or authorized by, law; specif., contrary to, or in violation of, human law; unlawful; illicit; hence, immoral; as, an illegal act; illegal trade; illegal love. Bp. Burnet.
INDETERMINATE a.
rminate quantity (Math.), a quantity which has no fixed value, but which may be varied in accordance with any proposed condition. -- Indeterminate series (Math.), a series whose terms proceed by the powers of an indeterminate quantity, sometimes also with indeterminate exponents, or indeterminate coefficients. -- In`…
INFORMAL a.
Not in the regular, usual, or established form; not according to official, conventional, prescribed, or customary forms or rules; irregular; hence, without ceremony; as, an informal writting, proceeding, or visit.