English

Adjective

nothing special

1. (idiomatic) ordinary, run-of-the-mill

   The sandwich was plain old junk food, nothing special.

Noun

nothing special

1. (idiomatic) nothing worth discussing; nothing that the speaker wants to mention

Often used as an evasion or conversation-stopper, when nosy queries are made. It's an indirect way of telling someone to "mind his own business".