
halbwegs
somewhat
Expresses that something applies to a certain extent, but not completely; reasonably or fairly.
Nach der Reparatur war das Auto wieder halbwegs fahrtüchtig.
After the repair, the car was somewhat roadworthy again.
somewhat / halfway
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somewhat
Expresses that something applies to a certain extent, but not completely; reasonably or fairly.
Nach der Reparatur war das Auto wieder halbwegs fahrtüchtig.
After the repair, the car was somewhat roadworthy again.

halfway
Describes the position in the middle of a route or path.
Wir waren halbwegs in den Bergen, als das Gewitter anfing.
We were halfway into the mountains when the thunderstorm started.
The word is made up of 'halb' (half) and 'Wegs' (an old genitive form of 'Weg' (way/path)). Its literal meaning is therefore 'halfway along the way', from which the figurative meaning 'somewhat' or 'partly' is also derived.
Das Projekt ist schon halbwegs fertig.
The project is already somewhat finished.
You can recognize the meaning from the context. If it is about a route or path, it refers to the spatial middle. If it is about a quality or state, it means 'somewhat'.
Halbwegs zwischen den beiden Städten machten wir eine Pause.
Halfway between the two cities, we took a break.
In the meaning 'somewhat', 'halbwegs' usually stands directly before the adjective, participle, or adverb it describes. It slightly weakens its meaning.
Die Wohnung war nach dem Fest wieder halbwegs sauber.
After the party, the apartment was somewhat clean again.
pretty / fairly
Both words show that something is only partly or not true to the highest degree. Ziemlich usually emphasizes a higher, considerable degree, while halbwegs often means that something is just acceptable or only moderately successful. Use ziemlich for a stronger assessment and halbwegs for a weaker one.

Der Plan ist halbwegs gut.
The plan is somewhat good.
Der Plan ist ziemlich gut.
The plan is pretty good.