Adjective

(en adjective)

Idiotic or unthinkable, often to the point of being funny.

*

, title=(The Celebrity), chapter=3 , passage=Now all this was very fine, but not at all in keeping with the Celebrity's character as I had come to conceive it. The idea that adulation ever cloyed on him was ludicrous in itself. In fact I thought the whole story fishy, and came very near to saying so.}}

Amusing by being plainly incongruous or absurd.

* 2014 , , " Southampton hammer eight past hapless Sunderland in barmy encounter", The Guardian , 18 October 2014:

Five minutes later, Southampton tried to mount their first attack, but Wickham sabotaged the move by tripping the rampaging Nathaniel Clyne, prompting the referee, Andre Marriner, to issue a yellow card. That was a lone blemish on an otherwise tidy start by Poyet’s team – until, that is, the 12th minute, when Vergini produced a candidate for the most ludicrous own goal in Premier League history.

* , title=The Mirror and the Lamp

, chapter=2 citation , passage=She was a fat, round little woman, richly apparelled in velvet and lace, […]; and the way she laughed, cackling like a hen, the way she talked to the waiters and the maid, […]—all these unexpected phenomena impelled one to hysterical mirth, and made one class her with such immortally ludicrous types as Ally Sloper, the Widow Twankey, or Miss Moucher.}}

Adjective

(wikipedia undefined) (-)

Lacking a definition or value.

(mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.

The result of division by zero is undefined .