It is most infrequent that I have friends yelling about bat-shaped lawnmowers in my room at one in the morning.
His letters became infrequent, then stopped completely
At the end of a interesting story i put a conclusion in it.
Snow in Mexico is very infrequent. It's very infrequent that I go see a movie. Use in place of words such as occasional, rare, scarce, uncommon, unusual, not often, sporadic. Try doing a search on at google.com for the word and see what examples are there.
The geology we learned today was interesting. Geology is an interesting subject. My friend likes to study geology. We have a geology test tomorrow. (I don't think this sentence is that good)
I am interesting. You are interesting. She is interesting. He is interesting. Something of the sort.
The author wrote a very descriptive and interesting novel. Or: It was so innovative and unique, it was truly a novel idea.
Data mining can uncover interesting patterns. Some cookies will upload solely for the purpose of data mining.
Interesting and very difficult to put into x amount of letters.
There was an interesting silence in the room when the principle came in.
interesting
Put the whole sentence, and more of the context, if possible, in the discussion area. This sounds like an interesting figure of speech, but there's not enough to go on.
It means not frequently. Infrequent things happen rarely or hardly ever. A lunar eclipse is an infrequent event.