Expert IELTS p. 91

U.S. spelling of "colour"

different and not ordinary, often in a way that is interesting or exciting

not interesting

red, blue, green, yellow, etc (UK)

having bright colours (UK)

very simple, with nothing special added

to make someone feel very happy and enthusiastic (verb)

easy to use or suiting your plans well, or easy to get to

U.S. spelling of "colourful"

extremely interesting