dulls
v.
使变钝( dull的第三人称单数 );
使（兴趣、痛苦等）减少;
使麻木;
使晦暗;
例句:
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Time dulls the most exquisite emotions and softens the most heartrending grief.
时间会缓和最激烈的情感,减轻最伤心的悲痛.
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This cheap knife dulls easily.
这把便宜的刀容易变钝.
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Watching television dulls one's wits.
看电视能使人头脑迟钝.
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Dancing dulls the brain a bit.
来自R. Lehmann
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It's a double-edged sword. She concluded that too much dependence on technology dulls one's ability to connect with others.
来自WSJ