Antonyms of adj instrumental

2 senses of instrumental

Sense 1
instrumental (vs. vocal) -- (relating to or designed for or performed on musical instruments; "instrumental compositions"; "an instrumental ensemble")

vocal (vs. instrumental) -- (relating to or designed for or using the singing voice; "vocal technique"; "the vocal repertoire"; "organized a vocal group to sing his compositions")

Sense 2
implemental, instrumental, subservient -- (serving or acting as a means or aid; "instrumental in solving the crime")

INDIRECT (VIA helpful) -> unhelpful -- (providing no assistance)

Similarity of adj instrumental

2 senses of instrumental

Sense 1
instrumental (vs. vocal) -- (relating to or designed for or performed on musical instruments; "instrumental compositions"; "an instrumental ensemble")

Sense 2
implemental, instrumental, subservient -- (serving or acting as a means or aid; "instrumental in solving the crime")
       => helpful (vs. unhelpful) -- (providing assistance or serving a useful function)