Unaccustomed (esp. to something, or with infinitive) (now frequently with pronunciation/ʌnˈjuːst/) before to.

Unused or unaccustomed to a thing; inexperienced. Obsolete.

Unaccustomed to something. Obsolete or archaic.

Not wont, used, or accustomed to do something. Cf. unwonted, adj. 2. (a).

Unaccustomed, unused.

Not made familiar by practice; unused or unaccustomed to something. Used (a) predicatively with to, or elliptically, and (b) attributively.

(un-, prefix1 affix 2.)

Not habituated by time or experience.

Not accustomed or habituated. Const. to.

(un-, prefix1 affix 1.)

(un-, prefix1 affix 2.)

Not habituated by long practice; inexperienced. Const. in.

(un-, prefix1 affix 2.)

(un-, prefix1 affix 2.)

= unhabituated, adj.