Frustrate
Block
Synonyms Thwart, foil, stop, counter, check, circumvent, forestall, dash, quash, derail, baffle, snooker, impede, hinder, fetter, cripple, stand in the way of, stymie, screw up, put the lid on, do for, defeat, block, put a stop to, spoil, balk, disappoint, bar, scotch, crush, nip in the bud, nullify, obstruct, hamper, stifle, hamstring, put a brake on, spike someone's guns, foul up, put the kibosh on, banjax, and scupper.
Anger
Synonyms Exasperate, annoy, madden, irritate, embitter, get someone's back up, discourage, dispirit, dissatisfy, aggravate, drive crazy, miff, get to, wind up, nark, infuriate, anger, vex, irk, sour, try someone's patience, dishearten, depress, make discontented, drive mad, bug, hack off, get under someone's skin, get on someone's wick, and give someone the hump.
Example Sentences
His silence began to frustrate.
The delay will frustrate everyone.
Unclear instructions always frustrate me.
Losing constantly can frustrate players.