Unwavering – He had unwavering confidence that his team would win the championship.
un - not (not changing or decreasing)
Impasse – The two friends reached an impasse in their argument and refused to talk.
im - not (could not get past)
Inhabitants – The inhabitants of the island built their homes near the beach.
in - in/into/within (their habitat - where they live - is in the island)
Unwind – After a long day, I like to unwind by listening to music.
un - not (not wound up or stressed)
Irrelevant – His comment about video games was irrelevant to our math lesson.
ir - not (not related)
Aeronautics – She dreams of studying aeronautics so she can design airplanes one day.
aero - air
Regain – After resting for a while, I was able to regain my energy.
re - again (get it back)
Underestimated – I underestimated how hard the test would be and didn’t study enough.
under - not enough (did not consider enough)
Embody – She tried to embody kindness by always helping others.
em - into/cause to (cause to have a physical form)
Transatlantic – The explorers took a transatlantic journey from Europe to America.
trans - across (across the Atlantic Ocean)
Unreceptive – The teacher was unreceptive to my excuse for not finishing my project.
un - not (not receiving my excuse)
Infuriate – It will infuriate my mom if I forget to do my homework again.
in - cause to be (cause to be furious)
Irrational – It’s irrational to be afraid of a tiny bug that can’t even hurt you.
ir - not (not rational or logical)
Immortal – In myths, some gods and heroes are immortal and never grow old.
im - not (will not die)
Overlook – Don’t overlook the small details in your science project!
over - too much, above (look above where you should)
Misguided – His decision to skip school was completely misguided.
mis - wrongly (bad judgment)