WordNet sense 1 (weedy annual grass often occurs in grainfields and other cultivated land; seeds sometimes considered poisonous):

tare, darnel, bearded darnel, Lolium temulentum

WordNet sense 2 (weedy annual native to Europe but widely distributed as a weed especially in wheat):

chess, Bromus secalinus

WordNet sense 3 (someone who leads you to believe something that is not true):

beguiler, cheater, deceiver, slicker, trickster

WordNet sense 4 (be sexually unfaithful to one's partner in marriage):

betray, wander, cheat on

WordNet sense 5 (engage in deceitful behavior; practice trickery or fraud):

chisel

WordNet sense 6 (defeat someone in an expectation through trickery or deceit):

jockey, screw, shaft, chicane, chouse

WordNet sense 7 (the act of swindling by some fraudulent scheme):

rig, swindle

WordNet sense 8 (a deception for profit to yourself):

cheating