Some pairs of adverbs have different meanings

deep = a long way down (He dug deep into the ground.)

deeply = greatly (The scientist was deeply respected.)

free = without cost (Children travel free on buses.)

freely = willingly (He spoke freely about his past.)

hard = with effort (He works hard.)

hardly = scarcely (I hardly see him.)

high = to / at a high level (The pilot flew high above the clouds.)

highly = very much (She is highly regarded by her employers.)

last = after all others (He got here last.)

lastly = finally (Lastly, read the instructions then do the test.)

late = not early (They arrived late.)

lately = recently (I haven’t seen him lately.)

near = close (I live near the school.)

nearly = almost (I have nearly finished.)

pretty = fairly (I thought the film was pretty awful.)

prettily = in a pretty way (She smiled prettily.)

short = suddenly (The driver stopped short.)

shortly = soon (He will be arriving shortly.)

wide = far away from the right point (He threw the ball wide.)
widely = to a large extent (It’s widely believed that the Prime Minister will resign soon.)