check – v. to examine something

negative – adj. lacking something

reminder – n. something that causes you to remember something

invisible – adj. unable to be seen

unattractive – adj. unappealing

contract – n. an agreement between people and/or companies (often a legal agreement)

psychologist – n. someone who studies mental states, behavior and emotional or social processes

mode – n. a way in which something is done or experienced

backpack – n. a container or object for carrying things on one's back

chat – n. a light and friendly discussion