trying (adj.)

• adverse
• analytic
• annoying
• antagonistic
• arduous
• backbreaking
• bothersome
• burdensome
• conflicting
• contrary
• counter
• counteractive
• crushing
• demanding
• detrimental
• difficult
• dispiriting
• disquieting
• distressing
• draining
• empirical
• enervating
• enfeebling
• exacting
• examining
• exasperating
• exhausting
• exigent
• experimental
• explorative
• exploratory
• fact-finding
• feeling
• frustrating
• groping
• grueling
• hard
• harmful
• heavy
• hefty
• heuristic
• hit-or-miss
• hostile
• infuriating
• inimical
• investigative
• investigatory
• irksome
• irritating
• killing
• maddening
• miserable
• onerous
• opposed
• opposing
• opposite
• oppressive
• painful
• plaguey
• probationary
• probative
• probatory
• proving
• provisional
• punishing
• rigorous
• rough
• sinister
• sticky
• straining
• strenuous
• stressful
• superincumbent
• taxing
• tentative
• test
• tiresome
• tiring
• toilsome
• tough
• trial
• trial-and-error
• tricksy
• tricky
• troublesome
• troublous
• unfavorable
• untoward
• upsetting
• verificatory
• vexatious
• vexing
• weakening
• wearing
• wearisome
• wearying
• weighty
• worrisome
• worrying
• wretched