As an adverb, it can only intensify other modifiers, and usually adjectives at that: it does not intensify verbs. You cannot *real hope for something, but you can be real hopeful that things will get better “real soon now” — at least in some dialects.
The original Teut. adjs. in -lîko- were compounds of the
sb. *lîkom appearance, form, body (see lich). Thus
*mannlîko- (‘manly’) means etymologically ‘having the
appearance or form of a man’; gôðolîko- (‘goodly’) ‘having
a good appearance or form’, or ‘having the appearance or form of
what is good’. The primitive force of the suffix may therefore be
rendered by ‘having the appearance or form indicated by the first
element of the word’; but while in the historical Teut. langs. it
has remained capable of expressing this meaning, it has in all of
them acquired a much wider application.
sb. *lîkom appearance, form, body (see lich). Thus
*mannlîko- (‘manly’) means etymologically ‘having the
appearance or form of a man’; gôðolîko- (‘goodly’) ‘having
a good appearance or form’, or ‘having the appearance or form of
what is good’. The primitive force of the suffix may therefore be
rendered by ‘having the appearance or form indicated by the first
element of the word’; but while in the historical Teut. langs. it
has remained capable of expressing this meaning, it has in all of
them acquired a much wider application.
The form-history of the suffix in Eng. is similar to that of -ly1:
in ME. the OE. -líce was normally represented by -līche
(southern), -līke (northern), the compar. being -lī̆ker,
-luker, -loker (superl. -est).
in ME. the OE. -líce was normally represented by -līche
(southern), -līke (northern), the compar. being -lī̆ker,
-luker, -loker (superl. -est).
Citations from COCA:
The Corpus of
Contemporary Contemporary American English
(from 1990–2012)
Real language is much more complicated and nuanced than a third-grader’s grammar book will ever reveal. If you want a simplified version of reality, by all means, read the third-grader’s book. Just understand that it isn’t real good at telling you anything about how real people really talk. It’s all something something of an inconvenient lie, or at best, so simplified a version of reality as to no longer bear much semblance of the same.