Gradually Harmful, Sinister, Cunning
This page is the CodyCross answer for the clue below from Popcorn Time, Group 383, Puzzle 4 (Costume Designer).
Question is: Gradually Harmful, Sinister, Cunning
and the answer is: INSIDIOUS
Word Meaning:
INSIDIOUS — Causing harm in a stealthy, often gradual, manner.
Definitions from Wiktionary.