Mad, crazy, insane are used to characterize wildly impractical or foolish ideas, actions, etc. Mad suggests senselessness and excess: The scheme of buying the bridge was absolutely mad.
Re: "Lifes" no existe. The only way to use this word would be as a singular possessive meaning "life has." Ex: 1. His life's changed a lot since he married and settled down.
The only context in which lifes is correct is when you are discussing still lifes, paintings that show things like flowers and fruit. In every other context, the correct plural of life is lives. This is a common pattern of English nouns that end in "...ife:" wife/wives, knife/knives, and so on, though unfortunately it doesn't apply to all of them.
A still life (plural still lifes) is a work of art depicting mostly inanimate subject matter, typically commonplace objects which may be either natural (food, flowers, plants, rocks, or shells) or man-made (drinking glasses, books, vases, jewelry, coins, pipes, and so on).
I'm redacting a document where I wrote the following sentence: "... to use as useful tool in their daily lives" But I'm not sure if I've should used "daily lifes". When should I use one expression instead the other?
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