inimical
Inimical (adjective) means tending to harm something or make it impossible; working against it. Example: “Long hours are inimical to good judgement.”
How to use inimical
Learner’s notesIn plain EnglishWorking against something, or plainly unfriendly.
Formal and rather bookish; common in legal, political and academic prose.
Note the shared root with amicable: in- plus friend gives you not-friendly.
Trace the full origin ↓Fill the gap
Can you complete this real example?
Long hours are _____ to good judgement.
Etymology
From Late Latin inimicalis, from Latin inimicus 'enemy', formed from in- 'not' and amicus 'friend'.