A (沒意思) 没意思 mei2 yi4si
uninteresting/ dull
uninteressant, langweilig, nicht der Rede wert

B (單調) 单调 dan1diao4
monotonous/ dull
monoton

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Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

單 单 single, individual, only / lone
調 调 transfer, move, change / tune

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