Adjective

(en adjective)

Not expected, anticipated or foreseen.

* , 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.}}

*

The windmill presented unexpected difficulties.

Adjective

(en adjective)

Not conforming to rule or system; deviating from the usual or normal type.

* 1899 , (Arthur Conan Doyle), A Duet , ch. 6:

And then after an abnormal meal, which was either a very late breakfast or a very early lunch, they drove on to Victoria Station.

Of or pertaining to that which is abnormal, in particular, behaviour that deviates from norms of social propriety or accepted standards of mental health.

* 1904 , (Jack London), The Sea Wolf , ch. 23:

Furuseth was right; I was abnormal , an "emotionless monster," a strange bookish creature, capable of pleasuring in sensations only of the mind.