Definitions

1. adjective

Having or showing a lack of strong emotions or interest, often to the point of being unenthusiastic or unimpressed.

“The critic found the new movie to be sosoish, lacking any real depth or excitement.”

2. adverb

In a way that is unenthusiastic or unimpressed, to a lackluster degree.

“He performed the song sosoish, which didn’t really capture the audience’s attention.”