GRE

invoke - call upon; ask for :: call (up)on appeal to

invulnerable - incapable of injury

iota - very small quantity

irascible - irritable; easily angered

irate - angry

iridescent - exhibiting rainbowlike colors

irksome - annoying; tedious

ironic - occurring in an unexpected and contrary manner

irony - hidden sarcasm or satire; use of words that convey a meaning opposite to the literal meaning

irreconsilable - incompatible; not able to be resolved

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