Well it IS a team game and you should have allies to help you out either by healing you or stunning the enemy. "stun locks" is by far the easiest thing to counter when you have an ally. off the top of my head.
Silence:
Smoke Screen,Gust,Last Word,Waning Rift,Silence,blood rage, doom,crippling fear,orchid
Mana Reduction skills:
EMP, Mana Burn,Mystic Snake, Nether Ward
Immunity :
Rage, Repel,linkens sphere,black king bar
There are far harder combos to deal with like
Essence Shift,Fury Swipes,geostrike,frostmourne
and good old
Totem,Jinada,Geminate