It means it causes annoyance, displeasure. That annoys, uncomfortable, bores, angers or angers. It tires, it produces exhausted. Unpleasant, foolish, tired, boring.
Unfriendly. Someone unpleasant in every aspect. By ej. Pedrito gets unbearable, when they not let him win a game, gets Odioso!.
tedious inopportune flea annoyingly ostentatious