Synonyms of diagnostic

Adjective

1. diagnostic

usage: concerned with diagnosis; used for furthering diagnosis; "a diagnostic reading test"

2. diagnostic, symptomatic, characteristic (vs. uncharacteristic)

usage: characteristic or indicative of a disease; "a diagnostic sign of yellow fever"; "a rash symptomatic of scarlet fever"; "symptomatic of insanity"; "a rise in crime symptomatic of social breakdown"

Definition and meaning of diagnostic (Dictionary)