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Is there a word that means "not knowing when to stop"? I haven't been able to think of one as of yet.

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up vote 7 down vote accepted

It does rather depend on context. Reckless will often fit, but so might unrestrained, undisciplined, careless, and several others.

Personally I think the best "single-word" answer is intemperate - having or showing a lack of self-control; immoderate. It's particularly associated with not knowing when to stop drinking alcohol, but that doesn't prevent its use in other contexts.

Note that temper has many meanings; in "intemperate" it's the verb to moderate, or tone down.

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I like intemperate, that seems like what I'm going for. +1 – XenElement Nov 3 '11 at 22:08

Compulsive might do what you want.

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Depending on context, you may use unrestrained or unbridled.

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Incessant. continuing without interruption; ceaseless; unending

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-1: Incessant is normally applied to abstract things, such as noise, which can't meaningfully "know" anything, let alone when to stop. – FumbleFingers Mar 19 '12 at 3:30

Some possibilities: blithe, sense 2, "Indifferent, careless, showing a lack of concern"; uncurbed, "Unlimited; unrestricted"; gung ho, "Very enthusiastic or energetic"; high-handed, "Using power or authority without proper consideration for the feelings or rights of others"; and perhaps manic, speed demon, overboard, over the top, heavy-handed, lead-footed, roughshod, heedless.

Some facetious suggestions: unbrakeable; brakeless; brake-challenged.

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