This exercise illustrates the complexity of the system, and students can be forgiven for not getting all the right forms.
- unfriendly
- indefinite
- dishonest
- undo
- insecure
- disconnect
- unconscious
- unjust*
- injustice*
- uninterested**
- non-inflammable
- dislike***
* Although the general rule seems to be in- for Latinate words (insecure) and un- for Germanic words (unfriendly), this pair shows that it is not a hard and fast rule.
** A second possibility here is disinterested. In theory, the meaning is different,uninterested meaning ‘bored’, disinterested meaning ‘impartial’, ‘objective’. Many native speakers, however, use disinterested in the same sense asuninterested .
*** This is the form if you take like to be a verb. If it is understood to be an adjective, the form would be unlike .