most abecedarian (adjective) elementary: simple, basic
Sinonime: admonish,
advise,
alarm,
alert,
apprise,
dissuade,
flag, forbode, give fair warning, give the high sign, portend, premonish, pull one's coat, put a bug in one's ear, put on guard, put one wise, telegraph,
tip, tip off, wave a red flag
Antonime: abstruse,
advanced,
complex,
complicated,
compound,
difficult,
hard,
intricate,
involved,
secondary