not easy (?.)

• Herculean
• abstruse
• adverse
• antagonistic
• arduous
• brutal
• complex
• conflicting
• contrary
• counter
• counteractive
• critical
• delicate
• demanding
• detrimental
• difficile
• difficult
• exacting
• formidable
• hairy
• hard
• hard-earned
• hard-fought
• harmful
• hostile
• in opposition
• inimical
• intricate
• jawbreaking
• knotted
• knotty
• laborious
• mean
• miserable
• no picnic
• operose
• opposed
• opposing
• opposite
• rigorous
• rough
• rugged
• set with thorns
• severe
• sinister
• spiny
• steep
• strenuous
• stressful
• thorny
• ticklish
• toilsome
• tough
• tricky
• troublesome
• troublous
• trying
• unfavorable
• untoward
• uphill
• wicked
• wretched