The definition for gruff is "Rough or stern in manner or speech." Used in a sentence: Heidi's grandfather was gruff, barking stern orders and hardly smiling. The definition for compulsion is "an irresistible impulse.", the definition for implement is "To carry out or accomplish.", and the definition for combustion is "Act of burning."

The definition for corrosive is "Bitingly sarcastic." Used in a sentence: The cruel Estella's corrosive comments made Pip cry. The definition for pallid is "lacking color.", the definition for augment is "To make greater.", and the definition for untenable is "Not able to be defended."

The definition for scamper is "To run quickly." Used in a sentence: The frightened kitten scampered away from the butterfly. The definition for disdain is "feeling of contempt.", the definition for incongruous is "Not harmonious, incompatible.", and the definition for frugal is "Thrifty, cheap."

The definition for dubious is "Questionable." Used in a sentence: Karl found Kevin's claim that he was sick dubious, as he had just seen him playing football. The definition for aerate is "to supply with air.", the definition for iridescent is "Having a lustrous or attractivve quality.", and the definition for distortion is "The act of twisting out of shape."

The definition for placebo is "An inactive substance used in medical testing." Used in a sentence: Tom, who had taken the placebo, found that his allergy symptoms did not go away. The definition for sociable is "inclined to seek companionship.", the definition for pathos is "Sympathetic pity.", and the definition for punctual is "On time."