direct

We flew direct from Buenos Aires to Salta.

without stopping

directly

Don´t go. I'll be with you directly.

inmediately, very soon

late

The plane arrived late due to bad weather

not on time,  not early 

lately

He's been rather ill lately.

recently

high

She lifted it high over her head

to a great height

highly

Arsenic is highly toxic.

extremely

hardly

They hardly know their neighbours.

scarcely, 

almost not.

hard

She braked hard when she saw the dog.

with a lot of effort,

 severely

right

1. Turn right at the crossroad

2. Try to do it right this time!

1.direction

2. correctly

free

We got into the concert free!

without paying

freely

Sheep roam freely over the hills.

without limitation or control

deep

They explored deep into the jungle.

to a great depth/distance 

deeply

We are deeply ashamed of our behaviour.

thoroughly

sharp

Please, be here at nine o'clock sharp.

punctually, exactly

sharply

She spoke to him rather sharply.

in a critical, rough or severe way.

loud

Don´t talk so loud.

in a way that makes a lot of noise or can be easily heard.

(Informal usage)

loudly

The audience laughed loudly at the joke

1. =loud (more formal usage)

2.in manner that attracts attention