Word Study
stressful
OXFORD DICTIONARY
stressful, adj. causing stress; mentally tiring (had a stressful day).
Derivative
stressfully adv. stressfulness n.
THESAURUS
stressful
adverse, antagonistic, conflicting, contrary, counter, counteractive, detrimental, difficult, draining, exhausting, fatiguesome, fatiguing, grueling, hard, harmful, hostile, in opposition, inimical, killing, miserable, not easy, opposed, opposing, opposite, punishing, rigorous, sinister, straining, tiresome, tiring, toilsome, troublesome, troublous, trying, unfavorable, untoward, weariful, wearing, wearisome, wearying, wretchedFor further exploring for "stressful" in Webster Dictionary Online