Unusual is a synonym of atypical.
As adjectives the difference between atypical and unusual
is that atypical is not conforming to the normal type while unusual is unlike what is expected; differing in some way from the norm.
As a noun atypical
is an atypical antipsychotic.
atypical
English
Adjective
(
en adjective)
Not conforming to the normal type.
Unusual or irregular.
Noun
(
en noun)
(pharmacy) An atypical antipsychotic.
unusual
English
Alternative forms
* unusuall (obsolete)
Adjective
(
en adjective)
Unlike what is expected; differing in some way from the norm.
*
, title=(
The Celebrity), chapter=2
, passage=I had occasion […] to make a somewhat long business trip to Chicago, and on my return […] I found Farrar awaiting me in the railway station. He smiled his wonted fraction by way of greeting, […], and finally leading me to his buggy, turned and drove out of town. I was completely mystified at such an
unusual proceeding.}}
-
Not usual.
Synonyms
* (different from the expected) abnormal, rare, strange, weird, (stronger) extraordinary
** See also
Antonyms
* (different from the expected) normal, usual