estresante
/estɾeˈsante/ · B2 · adj
stressful, nerve-racking
😰 es-TRES-ante = stress with a TRES (three) pile-up: stress-ful
Estresante comes from estrés (stress) plus the adjective ending -ante, like English -ing. Read it as stress-ing: something that stresses you out. The root estrés is a near twin of English stress, so the link is easy to hold.