undivided
adj.complete and not shared with anything else. You use this to describe attention or support that is given entirely to one person or task.
adj.not shared, split, or distributed among others; complete and whole. Often used to describe abstract qualities like attention, loyalty, or support.
“You have my undivided attention.”
“The manager promised her undivided support for the new project during the board meeting.”
“To solve such a complex mathematical proof, the researcher required hours of undivided concentration, free from the typical interruptions of the busy office.”
Typically used attributively before a noun like 'attention', 'loyalty', or 'support'.
“While most countries regard East Jerusalem as illegally occupied by Israel since the Six Day War in 1967, Israel says Jerusalem is its undivided capital.”
From un- + divided.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.