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Updated
Gouge - ANSWER-Evacuate, scrape, hollow
Refractory - ANSWER-Stubborn, obstinate
Supersede - ANSWER-Displace, replace
Stolid - ANSWER-Impassive,dull,unemotional
Placate - ANSWER-Pacify, appease
Inadvertently - ANSWER-Without knowledge or intention
Apprise - ANSWER-Inform, advice
Efficacy - ANSWER-Effectiveness,potency,success
Diffidence - ANSWER-Self doubt, timidity
Tractable - ANSWER-Malleable,pliable
Lethargic - ANSWER-Sluggish,torpid
Pragmatic - ANSWER-Practical,sensible
Ambigous - ANSWER-Equivocal,debatable