idea, n. [conception], [notion], [opinion], [fancy], impression; [intention], [design].
ideal, a. [faultless], [consummate], [perfect].
idiocy, n. [imbecility], [foolishness], fatuity, [folly], senselessness
idiot, n. [imbecile].
idiotic, a. [imbecile], [foolish], fatuous, [senseless].
idle, a. leisure; [vain], [unavailing], [futile], ineffectual; [indolent], [slothful], [inactive], [lazy], otiose.
idleness, n. [indolence], [sloth], [inaction], [laziness]; futility, [vanity]. Associated word: Cocagne.
idler, n. sluggard, [drone], lounger, loafer, dawdler, donothing.
idol, n. image (of a divinity), effigy, graven [image]; Juggernaut. Associated words: idolater, idolatrous, idolatry, [idolize], iconoplast, iconoclast, iconodule, idolomania, iconography, iconology, idoloclast, iconomachy, ting, iconolatry.