undivided
Undivided (adj) means Whole and complete; not split into separate parts, or fully focused. Example: “The teacher asked for the class's undivided attention.”
How to use undivided
Learner’s notesIn plain EnglishKept together as one whole thing, without being split up.
Most often used in the fixed phrase "undivided attention," meaning full, uninterrupted focus.
Fill the gap
Can you complete this real example?
The teacher asked for the class's _____ attention.
Etymology
From un- ("not") plus divided, the past participle of divide.