
reibungslos
smooth
Proceeding without problems, difficulties, or disruptions.
Die Organisation der Veranstaltung verlief absolut reibungslos.
The organization of the event went absolutely smoothly.
smooth
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smooth
Proceeding without problems, difficulties, or disruptions.
Die Organisation der Veranstaltung verlief absolut reibungslos.
The organization of the event went absolutely smoothly.

frictionless
Functioning in a physical sense with very little or no friction.
Die reibungslose Bewegung der Teile sorgt für eine hohe Effizienz des Motors.
The frictionless movement of the parts ensures high efficiency of the engine.
The word is a combination of 'die Reibung' (friction), the linking -s, and the ending '-los' (-less), which means 'without.' 'Reibungslos' therefore literally means 'without friction,' which explains both meanings.
Dank der guten Vorbereitung verlief die Konferenz reibungslos.
Thanks to the good preparation, the conference went smoothly.
The figurative meaning (without problems) is much more common in everyday language. The literal meaning (without physical friction) is found almost only in technical or physics contexts.
Der Übergang zur neuen Software verlief reibungslos.
The transition to the new software went smoothly.
In the figurative meaning, 'reibungslos' (smoothly) is often used with verbs such as 'verlaufen' (to proceed), 'funktionieren' (to function), or 'klappen' (to work out), and nouns such as 'Ablauf' (process), 'Übergang' (transition), or 'Zusammenarbeit' (cooperation).
Die Zusammenarbeit im Team funktionierte reibungslos.
The teamwork functioned smoothly.
trouble-free
Problemlos and reibungslos both describe a process that takes place without difficulties. Problemlos focuses more on the absence of specific problems; reibungslos additionally emphasizes a smooth process without disruptions or interruptions.

Die Anmeldung verlief reibungslos und ohne jede Unterbrechung.
The registration proceeded smoothly and without any interruption.
Die Anmeldung war problemlos, weil keine technischen Schwierigkeiten auftraten.
The registration went smoothly because no technical difficulties occurred.