What you can call your friends

puerile / PYUR-ul / adjective

1 : juvenile
2 : childish, silly

"Puerile" may call to mind qualities of youth and immaturity, but the term itself is no spring chicken. On the contrary, it's been around for more than three centuries, and its predecessors in French and Latin, the adjectives "puéril" and "puerilis," respectively, are far older. Those two terms have the same basic meaning as the English word "puerile," and they both trace to the Latin noun "puer," meaning "boy" or "child." Nowadays, "puerile" can describe the acts or utterances of an actual child, but it more often refers (usually with marked disapproval) to occurrences of childishness where adult maturity would be expected or preferred.

reprobate / REP-ruh-bayt / noun

1 : a person foreordained to damnation

2 : a depraved person : scoundrel

These days, calling someone a "reprobate" is hardly a condemnation to hellfire and brimstone, but the original reprobates of the 16th century were hardened sinners who had fallen from God's grace. By the 19th century, "reprobate" had acquired the milder, but still utterly condemnatory, sense of "a depraved person." Gradually, though, the criticism implied by "reprobate" became touched with tolerance and even a bit of humor. It is now most likely to be used as it was in this August 1995 New Yorker magazine article about the death of musician Jerry Garcia: "It was suddenly obvious that Garcia had become, against all odds, an American icon: by Thursday morning, the avuncular old reprobate had smuggled his way onto the front pages of newspapers around the world."

inane / ih-NAYN / noun

: void or empty space

The adjective "inane" is now most commonly encountered as a synonym of "shallow" or "silly." But when this word first entered the English language in the early 17th century, it was used to mean "empty" or "insubstantial." It was this older sense that gave rise, in the latter half of the 17th century, to the noun "inane," which often serves as a poetic reference to the void of space ("the illimitable inane," "the limitless inane," "the incomprehensible inane"). This noun usage has not always been viewed in a favorable light. Samuel Johnson, in his Dictionary of the English Language (1755), says of "inane" that "it is used licentiously for a substantive," which in current English means that it is used as a noun without regard to the rules.