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Synonyms for Trying (same or very similar meaning)

WordNet sense 1 (not easy; requiring great physical or mental effort to accomplish or comprehend or endure):

WordNet sense 2 (extremely irritating to the nerves):
nerve-racking, nerve-wracking, stressful

WordNet sense 3 (not to your liking):

From the ODE community, based on WordNetadd/edit