Used as a file name extension (i.e. "<filename>.inf") the word inf abbreviates is Information.
INF is also used to abbreviate:
Interferon
Infinitive
If-Then-Else Normal Form
Industry Negative File
Inland Navigation Facility
Interface
Interference
Infantry
Infiltration
Infinium
Infinity
Intermediate-Range Nuclear Forces
International Naturist Federation
International Nepal Fellowship
Iron Fists (Delta Force Squadron)
Irradiated Nuclear Fuel
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The word "speaker" can be abbreviated as "spkr."
There is no antonym of the word "loyalty" that begin with "inf". You may be thinking of "infamy" but this an not an opposite of loyalty.
The word "hertz" can be correctly abbreviated as "Hz."
It's already abbreviated. But if you mean "What is doesn't abbreviated for?" it means does not.
ORG is how organization is abbreviated.
It is abbreviated to the "web".
influence
The word managed can be abbreviated in a couple different ways. These include "man" and "mgd". However, the word managed is not usually abbreviated.
Manager is abbreviated Mgr.
The word garden is generally not abbreviated because it is such a short word. However, it could be abbreviated as "gdn" or "grdn".
it is you've :)
The word narrow is not generally abbreviated because it is a very short word. However, it could be abbreviated as "nar".