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mostly
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primarily
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mainly
The problem was mainly his attitude.
Truck drivers are mainly men.
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chiefly
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zwłaszcza, głównie
My dad is fond of Italian dishes, chiefly spaghetti.
Fruit consist chiefly of water.
The majority of the group, chiefly boys, disagreed with the idea to go to a museum.
These articles are chiefly on current events.
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predominantly
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principally
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saliently
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prevailingly
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muchly