An absurdity is a state or condition of being extremely unreasonable, meaningless or unsound in reason so as to be irrational or not taken seriously. "Absurd" is an adjective used to describe an absurdity, e.g., "Tyler and the boys laughed at the absurd situation." It derives from the Latin absurdum meaning "out of tune", hence irrational. The Latin surdus means "deaf", implying stupidity. Absurdity is contrasted with being realistic or reasonable In general usage, absurdity may be synonymous with fanciful, foolish, bizarre, wild or nonsense. In specialized usage, absurdity is related to extremes in bad reasoning or pointlessness in reasoning; ridiculousness is related to extremes of incongruous juxtaposition, laughter, and ridicule; and nonsense is related to a lack of meaningfulness. Absurdism is a concept in philosophy related to the notion of absurdity.