inscrutable - Difficult to understand
inkling - A slight knowledge or suspicion; a hint
adjective
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Bad / Angryirate - Angry and displeased
verb
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Bad / Attackinundate - To overwhelm (someone) with things or people to be dealt with
adjective
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Bad / Attackinsidious - Proceeding in a gradual, subtle way, but with harmful effects
injurious - Causing or likely to cause damage or harm.
adjective
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Bad / Hostileinfuriating - Making one extremely angry and impatient; very annoying
adjective
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Good / Stronginvincible - Too powerful to be defeated or overcome
verb
See noun
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Good / Excitingintrigue - To arouse curiosity and interest by unusual, new, and fascinating qualities
noun
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Good / Smartingenuity - The quality of being clever, original, and inventive
adjective
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Bad / Delayinterminable - Endless (often used hyperbolically)
verb
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Bad / Aggressiveinstigate - To cause an event or situation to happen by starting some actions