instruction, n. [nurture], tuition, [teaching], [information], indoctrination, inculcation, [education], admonition; edification, enlightenment; propædeutics.
instructive, a. edifying, didactic, preceptive, [mentorial]; propædeutic.
instructor, n. [teacher], preceptor, tutor, [master], [coach], [mentor], [counselor], [monitor], trainer.
instrument, n. [tool], utensil, implement; [agent], [means], [medium].
insufferable, a. [intolerable], [unendurable]; [detestable], [offensive].
insufficiency, n. [deficiency], inadequacy.
insufficient, a. [inadequate], [deficient], incommensurate, [lacking].
insult, n. indignity, [affront].
insult, v. [offend], [affront], [flout].
insulting, a. [offensive], [contemptuous], contumelious, [scurrilous].