HackerVoca

intuition : insight
invaluable : priceless, precious
invariable : constant, uniform, unchangeable
involve : include, embrace, contain, comprise, entail verb [transitive]

1 to make it necessary to do something: Changing the computer system would entail substantial periods of re-training. | entail doing sth: My job entailed being on call 24 hours a day.

2 old use to arrange for your property to become the property of a particular person, especially your son, after your death

irritate : vex, fret1 verb fretted, fretting

1 [intransitive, transitive] especially spoken to feel worried about small or unimportant things, or to make someone feel like this: Don't you fret - everything will be all right.

[+ about/over]: Nicki was always fretting over something or other.

2 [transitive] to make something gradually smaller and weaker by rubbing it over a long period of time