Idiot
An idiot or moron was an insult for a stupid or foolish person, which included a number of synonymous informal terms such as blockhead, dimwit, dope, dullard, halfwit, imbecile, oaf, and ninny. 

In 2268, Bela Okmyx called Spock a dope after the Vulcan misunderstood the meaning of the phrase "put the bag on", taking it literally, when it meant kidnapping. ()

In 2285, Montgomery Scott redundantly called Spock a dumb ninny after the Vulcan entered the reactor room of the  without a protective suit. ()

In 2364, L.Q. Clemonds said to the crew, "I paid some idiot a lot of money to freeze me when I died, and I just got to hear the words." ()

In 2373, Q wondered what anyone saw in Chakotay, who he called a "big oaf". ()

In 2374, Brunt called Rom a moron. ()

In 2375, Flotter called Trevis a blockhead after the tree touched a flame and caught fire, despite Flotter's warning not to. ()

Also that year, Quark referred to Worf as "that lumbering Klingon oaf" while (oddly, according to the Ferengi) lamenting his not having been located. ()

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Insults