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Sentence Correction: Double Negative and Redundancy

Which of the following words is NOT a negation word?

The correct answer is undoubtedly.

Rarely and scarcely are both negation words. Note that words that begin with un- (e.g., unhappy, unhealthy) are NOT negation words, and this includes undoubtedly. This also applies to words beginning with in- (e.g., inaccurate, insane), dis- (e.g., disappear, disbelieve), etc.

The correct answer is undoubtedly.

Rarely and scarcely are both negation words. Note that words that begin with un- (e.g., unhappy, unhealthy) are NOT negation words, and this includes undoubtedly. This also applies to words beginning with in- (e.g., inaccurate, insane), dis- (e.g., disappear, disbelieve), etc.

The correct answer is undoubtedly.

Rarely and scarcely are both negation words. Note that words that begin with un- (e.g., unhappy, unhealthy) are NOT negation words, and this includes undoubtedly. This also applies to words beginning with in- (e.g., inaccurate, insane), dis- (e.g., disappear, disbelieve), etc.

Great!

Rarely and scarcely are both negation words and undoubtedly is not, because it begins with un- (like unhappy, unhealthy). Other prefixes (beginnings) which indicate non-negation words are in- (e.g., inaccurate, insane), dis- (e.g., disappear, disbelieve), etc.

rarely
scarcely
undoubtedly

I don't know