
Indifferent — having no interest or concern
Ingenuous — innocent, naive, candid (NOT ingenious!)
Innocuous — harmless, not offensive
Insipid — lacking flavor or interest, dull
Intransigent — unwilling to compromise, stubborn
Irascible — easily angered
Laconic — using very few words, concise
Laudable — deserving praise
Lethargic — sluggish, drowsy, lacking energy
Lucid — clear, easy to understand
DANGER PAIR: Ingenuous vs ingenious. Ingenuous = naive, innocent. Ingenious = clever, inventive. One letter difference, opposite meanings. The GRE will test this.
Reference:
TaskLoco™ — The Sticky Note GOAT