erholsam
restful
Having the quality of contributing to rest and relaxation and helping one regain strength.
Nach der anstrengenden Woche war der Schlaf besonders erholsam.
After the exhausting week, the sleep was especially restful.

restful
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restful
Having the quality of contributing to rest and relaxation and helping one regain strength.
Nach der anstrengenden Woche war der Schlaf besonders erholsam.
After the exhausting week, the sleep was especially restful.

The adjective 'erholsam' (restful) is closely related to the verb 'sich erholen' (to recover/rest). While 'sich erholen' describes the action of resting, 'erholsam' describes a quality that makes this recovery possible.
Nach einem erholsamen Wochenende fühle ich mich wieder fit.
After a restful weekend, I feel fit again.
'Erholsam' (restful) is often used to describe periods of time or states. Typical combinations are 'ein erholsamer Schlaf' (a restful sleep), 'ein erholsamer Urlaub' (a restful vacation), 'ein erholsames Wochenende' (a restful weekend), or 'eine erholsame Pause' (a restful break).
Ich wünsche dir einen erholsamen Urlaub am Meer.
I wish you a restful vacation by the sea.
Besides being used before a noun, 'erholsam' (restful) can also serve as an adverb to describe a verb. It then answers the question 'How?'.
Letzte Nacht habe ich endlich wieder erholsam geschlafen.
Last night I finally slept restfully again.
strenuous / exhausting
'anstrengend' and 'erholsam' are opposites. 'anstrengend' describes something that takes strength and makes you tired. 'erholsam' describes something that helps you regain your strength. 'entspannend' and 'erholsam' are similar, but 'erholsam' especially emphasizes that you feel better and more rested afterward. A weekend with a lot of work is 'anstrengend'. A quiet weekend without pressure is 'erholsam'.

Der Urlaub am See war sehr erholsam, weil wir viel geschlafen und nichts geplant haben.
The vacation by the lake was very restful because we slept a lot and planned nothing.
Am Wochenende war die Arbeit im Garten anstrengend, aber wir haben viel geschafft.
The garden work at the weekend was exhausting, but we got a lot done.