Select the INCORRECTLY spelt word.

To identify the incorrectly spelt word, let us examine each option individually:
1. Sufficeint: This spelling is incorrect. The correct spelling is Sufficient, where the letters 'i' and 'e' are arranged as 'ie' after 'c' (contrary to the common rule "i before e except after c" in this specific case, the correct word is spelled s-u-f-f-i-c-i-e-n-t). It means enough or adequate.
2. Syrup: This is spelled correctly. It refers to a thick, sweet liquid made by dissolving sugar in water.
3. Superior: This is spelled correctly. It means higher in station, status, or quality.
4. Shrubbery: This is spelled correctly. It refers to an area in a garden planted with shrubs.

Therefore, the word that is spelt incorrectly is "Sufficeint".