Illusive. Delusive, deceptive, deceitful, fallacious; visionary, unreal, disappointing, fugitive, erroneous, false, imaginary, illusory, chimerical.
Ant. Substantial, real, true, satisfactory, solid, permanent.
Illustrate. Elucidate, explain, exemplify, make clear; interpret, demonstrate, represent, embody, paint, image; adorn with pictures.
Ant. Obscure, misinterpret, confuse, mystify, darken, misrepresent.
Illustrious. Glorious, splendid, brilliant, bright, radiant; famous, famed, noted, renowned, distinguished, celebrated, eminent, signal, remarkable, conspicuous; deathless, noble.
Ant. Ignominious, disgraceful, infamous, inglorious, disreputable.
Ill will. Malevolence, unkindness, malice, enmity, hatred, hate, rancor, envy, grudge, uncharitableness, ill nature; antipathy, dislike, aversion.
Ant. Good will, benevolence, beneficence.
Im- or In-. This prefix, which is regularly in-, and which becomes il- before l, ir- before r, and im- before a labial, means in, into, on, or among, or denotes the negative not, or, occasionally, has a simple intensive meaning. Such words as begin with this prefix without modification of the combined meaning of the prefix and root word, will be easily derived from the antonyms and synonyms of the root words. Others of more derived meaning are found here.
Image. Statue; idol, object of worship; likeness, effigy, figure, resemblance, similitude, representation, picture; trope, metaphor; idea, copy, conception, fiction, shadow, vision.