Use 'symptomatic' to show there's a larger issue behind observed signs or events. His constant lateness was symptomatic of his disorganized lifestyle.
Pro Tip 2/3
Not Always Negative
While often negative, 'symptomatic' can be used in neutral contexts implying a representation. Vibrant street art is symptomatic of the neighborhood's cultural diversity.
Pro Tip 3/3
Avoid Misuse
'Symptomatic' isn't used for literal symptoms; choose 'has symptoms of' for that purpose. Incorrect: He is symptomatic a cold. Correct: He has symptoms of a cold.