✅ Slowness refers to the state of moving in a lazy, relaxed, or gradual way, with delays or without usual speed (The slowness of my computer was frustrating).

✅ Lethargy refers to the state of being sleepy, listless, or without energy (For me, a sense of lethargy sets in at the end of the week).

✅ Slowness refers specifically to movement or pace (The slowness of her walk suggested that she was sore from the hike).

✅ Lethargy is more general, and it can be used to imply laziness, but it more precisely suggests a lack of energy (I try getting outside to combat feelings of lethargy).

✅ Swiftness refers to the quality of moving quickly or without delay (I was pleased with the swiftness of the decision).

✅ Celerity refers to speed and promptness (He finished the project with remarkable celerity).

✅ Swiftness especially suggests an economical and light way of moving or doing something (Some dogs are known for their swiftness, and others for their laziness).

✅ Celerity, on the other hand, emphasizes the speed of the movement, and it is a less common and more formal word (The taxi driver got us to the airport with celerity).

✅ A cot is a light, portable bed (The hotel supplied an extra cot).

✅ A trundle bed, sometimes trundle, is a low bed on wheels which is designed to roll under another bed for storage (The spare trundle bed was comfortable enough for a sleepover).

✅ Cot can refer to any kind of bed that is easy to move or travel with. It can also refer to a hammock-like bed that hangs from a solid frame (I set up my cot in the corner of the room).

✅ Cot and trundle bed refer to two different types of beds, but both terms suggest beds that are portable or suitable for guests.