Englishfor English speakers
subtle
Adjective
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Subtle means small, slight, not easily noticed, understated.
The smile on the Mona Lisa is a subtle smile.
effect
Noun
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An effect is something that is caused by something else.
His comments had a visible effect on those who heard it.
The effect of the change was small.
—
If a law, agreement, change, etc. takes effect, it officially begins.
The closing of the company takes effect at midnight.
The new rules have been in effect since January.
effect
Verb
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If you effect a change, you make it happen.
I will effect the change without your help.