
die Bequemlichkeit
comfort
The state of having things pleasant, easy, and comfortable; comfort.
Das Hotel bietet den Gästen jegliche Bequemlichkeit.
The hotel offers its guests every comfort.
comfort / laziness
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comfort
The state of having things pleasant, easy, and comfortable; comfort.
Das Hotel bietet den Gästen jegliche Bequemlichkeit.
The hotel offers its guests every comfort.

laziness
A personal trait characterized by the desire to avoid effort and exertion; a tendency toward idleness.
Aus reiner Bequemlichkeit nahm er das Auto, obwohl er auch hätte laufen können.
Out of sheer laziness, he took the car, even though he could have walked.
The noun 'Bequemlichkeit' (comfort / laziness) is derived from the adjective 'bequem' (comfortable). The ending '-keit' forms feminine nouns that describe a quality or a state.
Er schätzt die Bequemlichkeit seiner neuen Wohnung sehr.
He greatly appreciates the comfort of his new apartment.
The meaning depends on the context. If people are talking about the comfort of things or places, the positive meaning is intended. If it is about the behavior of a person who wants to avoid effort, the negative meaning (laziness) is intended.
Dieses Auto bietet viel Platz und Bequemlichkeit.
This car offers plenty of space and comfort.
In the plural, 'die Bequemlichkeiten' (comforts), the word often refers to the comfortable facilities or amenities of a place, for example a hotel or an apartment. It then means roughly the same as 'Annehmlichkeiten' (amenities).
Das Fünf-Sterne-Hotel bietet seinen Gästen alle erdenklichen Bequemlichkeiten.
The five-star hotel offers its guests every imaginable comfort.
To express that someone is acting out of laziness, the phrase 'aus Bequemlichkeit' (out of laziness / for convenience) is often used. It gives the reason for a behavior.
Er fährt immer mit dem Aufzug, auch wenn er nur in den ersten Stock muss – aus reiner Bequemlichkeit.
He always takes the elevator, even if he only has to go to the first floor — out of sheer laziness.
comfort
Komfort and Bequemlichkeit both describe pleasant conditions. Komfort refers especially to the level of amenities and the comfort they provide. Bequemlichkeit emphasizes more that something is pleasant or easy to use.

Die einfache Bedienung der Geräte bietet den Mitarbeitern viel Bequemlichkeit.
The devices’ simple controls make things very convenient for the employees.
Die hochwertige Ausstattung des Büros bietet den Mitarbeitern viel Komfort.
The office’s high-quality amenities provide the employees with a great deal of comfort.