Quote Originally Posted by ConcreteButterfly View Post
Gait:
SLIs have a very smooth, graceful gait. They take their time, enjoy the process of walking. They are not clumsy.
LIIs move and talk faster, their attention is mostly in their heads than in their bodies, and it shows through slight jerkiness. Their breathing is also shallower.

Vocabulary:
SLIs are concise, they'll use fewer and simpler words over complex, unless there is a practical need for them.
LIIs can be verbal artists, they use many more words to flesh out their ideas, having fun with wordplay. Some are quite witty and talented in this regard, creating interesting analogies, puns, even new words to get their ideas across. Both use words like "basically" but LIIs will go into detail and fully explain their relevance, SLIs expect others to pick up the thread of their ideas on their own initiative (if they share their ideas at all).

Frequency of eye contact:
SLIs make more direct eye contact, even when they seem distracted they are subconsciously carefully noticing every movement around them.
LIIs are typical intuitives, their eyes either dart around (Ne) or zone out (Ni) even when they are directly interacting with someone. Duration of direct eye contact is much shorter.

Tendency to laughter:
SLIs are closed off to strangers beyond some forced smiling, they'll only laugh genuinely and openly around people they've developed an Fi bond with.
LIIs don't distinguish friends from strangers, they can easily laugh with both. Their emotions are also more inclusive, democratic. They don't hesitate to make fun of themselves or others if it'll lighten the mood. SLIs are relatively haughty, as though they are laughing at you rather than with you, or laughing at some private insight.

Manner of dress:
SLIs dress better, their clothes fit well and the colors match. Their style tends to reflect their peer group.
LIIs ignore the dress style of their peer group, they wear whatever they personally like, sometimes this can be very unique eg. purple hair. Sometimes their clothes are badly fitting and of poor quality, but they'll resist changing for the sake of impressing others.
Not a perfect reference. SLIs eyes of one subtype can dart back n forth a lot like a pendulum clock when looking at you. Don't mistaken this for LII.

Also, if I didn't know better I would read that description and think I am an LII because of the matches I pick up.