
teils
partly
Expresses that something applies or happens only in part or partially. A synonym of 'teilweise' (partially).
Der Weg war teils asphaltiert, teils ein Schotterweg.
The path was partly paved, partly a gravel road.
partly
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partly
Expresses that something applies or happens only in part or partially. A synonym of 'teilweise' (partially).
Der Weg war teils asphaltiert, teils ein Schotterweg.
The path was partly paved, partly a gravel road.

partly ... partly
A construction used to describe two different but simultaneously applicable aspects or components of something.
Ihre Reaktion war teils Überraschung, teils Freude.
Her reaction was partly surprise, partly joy.
The adverb 'teils' (partly) is an old genitive form of the noun 'der Teil' (part). It literally means 'of one part' and has become established as an independent word for 'teilweise' (partially).
Die Studierenden kamen teils aus Deutschland, teils aus dem Ausland.
The students came partly from Germany, partly from abroad.
The construction 'teils ... teils' (partly ... partly) always connects two equivalent parts of a sentence, words, or groups of words. Make sure that both parts have a similar grammatical form.
Das Publikum reagierte teils amüsiert, teils schockiert.
The audience reacted partly amused, partly shocked.
As a single adverb, 'teils' (partly) can stand flexibly in the sentence, often after the conjugated verb or at the beginning of the sentence for emphasis. It then modifies and limits the statement.
Die Renovierung ist teils schon abgeschlossen.
The renovation is partly already completed.
partly
Teilweise and teils both show that something is not completely the case. Teils is especially suitable when different cases or components differ, often in the construction teils ... teils. Teilweise is broader and can also refer to an incomplete amount without such a contrast.

Die Rückmeldungen waren teils positiv, teils kritisch.
The feedback was partly positive and partly critical.
Die Rückmeldungen waren teilweise positiv.
The feedback was partly positive.