Are you a serial hyphenator? Or do you just wish that was the least of your writing woes? Whether you’ve overused your life quota or have entirely missed the point of the all-too-often-misunderstood Great H, this one’s for you. Today’s tip comes from the good folks at Ragan.com:

Clear-cut rules for hyphens

By Denise C. Baron

Some may argue this makes the language colorful; others may say it drives them to drink.

Exasperating as it can be, at least it’s not boring; and sometimes, elements of the language will cause you to pause and reflect, if only to be certain that you’re using them correctly.

Take the hyphen — a little line that often makes a big difference but one that too often is misused, inserted where it doesn’t belong or missing altogether where it does. It’s the Rodney Dangerfield of punctuation; it deserves a lot more attention and respect than it gets.

The hyphen plays several roles. For one, it’s used to break up syllables in dictionary entries. For another, when the hyphen appears at the end of a syllable at the end of a line in print, it’s telling you that the remainder of the word has carried over to the following line; it’s signaling a continuance.

Grammatically, the hyphen’s main purpose is to ensure clarity, and here’s where things can get fuzzy. The hyphen commonly is used in a compound adjective — a phrase comprising two or more words that express a single concept. The compound adjective usually describes the noun that immediately follows it. One clue that a hyphen is needed to connect these words is when the lack of the hyphen causes the message to be unclear.

Here are some examples:

• fastest-growing population
• four-hour programs
• little-known company
• third-world country
• high-class ring-designer

Without the hyphens, these phrases could be misconstrued. They’ll stop you in your tracks as you read them, because without the hyphens, you cannot be sure what’s being conveyed.

The “fastest growing population” could be interpreted as a growing population that runs more quickly than any other growing population. “Four hour programs” could describe four programs that are each an hour long. A “little known company” could be a small business that is widely known. A “third world country” could be number three in a list of global nations.

However, for “high class ring designer,” is the reference to a designer of class rings who’s tipsy or to a skilled designer of rings, in general? The hyphens let you know.

Then there’s when not to use the hyphen.

Words such as firsthand, necktie and firewall are not hyphenated, and there are a slew of others that, even though you might think they should be hyphenated or have always hyphenated them or have always seen them hyphenated, aren’t. Adding to the confusion are words that, depending on their usage in a sentence, may or may not sport a hyphen. Lowdown, for instance, when used as a noun is a single word; however, used descriptively, as in that low-down, dirty, rotten scoundrel, it needs the hyphen.

Knowing with confidence when or when not to use the hyphen requires the assistance of a good dictionary, because as far as I can figure out, there’s no single rule to keep it all straight. Consider the word long. Just look at some of the many entries listed in Webster’s II New College Dictionary for nouns and adjectives that have long as a prefix:

• longboat: noun, no hyphen
• long suit: noun, space/no hyphen
• long-distance: adjective, hyphen
• longhair: noun, no hyphen
• longhorn: noun, no hyphen
• long-horned: adjective, hyphen
• longsighted: adjective, no hyphen
• long-winded: adjective, hyphen

Cocktails, anyone?

As for adverbs, most English usage manuals advise avoiding hyphens after “-ly” adverbs, such as “fairly close race” and “equally effective medication.” As the Associated Press Stylebook explains, readers expect such adverbs to modify the word that follows.

When in doubt about hyphenation, don’t guess. Instead, check your stylebook for guidance. Better yet, keep a good dictionary on hand — and use it. Or, even better, consult your local bartender.

Denise C. Baron is a director of global communications with Merck & Co., Inc.