un- The door was unlocked. She felt unhappy with the result. The path seemed unclear to him.
in- / im- The result was inaccurate. He’s immature for his age. The task seemed impossible.
il- Dumping waste is illegal. The logic behind it was illogical. He has an illegible handwriting.
ir- The pattern was irregular. His behavior was irrational. They found his explanation irrelevant.
non- The area is a non-smoking zone. It’s a non-toxic material. The claim is non-negotiable.
pre- He had a pre-existing condition. We got a pre-approved loan. The project is in the pre-planning stage.
post- The event is postponed to next week. We live in a post-industrial era. The post-operative care is essential.
anti- The medicine is anti-allergic. They organized an anti-racism rally. The software has an anti-virus feature.
dis- She showed displeasure at the news. The plan seems disorganized. The child felt disconnected from his peers.
mis- The misinformed crowd panicked. He felt misunderstood. The misplaced trust led to disappointment.
over- The bag was overloaded. He is overprotective of his sister. The project was overpriced.
under- The shirt was undersized for him. The task was underestimated. The team was underprepared for the challenge.
bi- The biannual event happens twice a year. The country is bilingual. The project was bifurcated into two phases.
multi- The task was multifaceted. The team was multidisciplinary. The project was multilayered.
pseudo- The gems were pseudo-crystals. The painting looked pseudo-realistic. The event was a pseudo-science conference.