Grammatically Correct: The writer's essential guide to punctuation ...

GRAMMATICALLY CORRECT
ad-hoc
bona-fide
post-hoc
vice-versa
ad hoc
bona fide
post hoc
vice versa
HYPHENATION WITH PREFIXES AND SUFFIXES
There isn't a single rule here that covers all words containing a
prefix or a suffix. Some never take a hyphen, some may take one,
some should take one and some must take one.
The majority of cases fall into the first category; that is, you run
the prefix or suffix in with the word it modifies. For example, you
would never use a hyphen in words such as unsaid, illogical,
playing, added or countable.
There are some cases where a hyphen may be a matter of choice.
For example, both versions of the following words are legitimate:
anti-hero/ antihero
bi-annual/biannual
co-ordinate/ coordinate
co-operate/ cooperate
infra-red/infrared
non-aggressive/nonaggressive
pre-mixed/premixed
semi-private/semiprivate
sub-optimal/suboptimal
ultra-violet/ultraviolet
It should be noted that the modern trend is to view such hyphens
as superfluous, and most scientific, technical, medical and government
publications will omit them. Putting them in doesn't do any
harm, but the words would read just as clearly and unambiguously
without them. If you are using a style guide, follow its rules. If you
are making your own decisions, be consistent: Don't randomly use
hyphens with some prefixes and suffixes and not others.
In a number of situations, a hyphen is strongly recommended. It
is a good idea to use one in the following circumstances:
WHEN THE COMBINATION OF ROOT WORD
AND PREFIX/SUFFIX IS UNUSUAL
You wouldn't hyphenate standard words such as premeditation,
worldwide or clockwise. However, references to "prewedding
arrangements," a "communitywide effort" or "his place could use
some improvementjurniturewise" would look a bit odd. Such (rela-
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