adj. 1
Wordy; verbose.
adj. 2
Everywhere or throughout everything; not focused or concentrated.
diffuse activity of the prefrontal cortex
v. 1
To spread (something) over or through as in air, water, or other matter, especially by fluid motion or passive means.
The small window diffuses light throughout the room.
v. 2
To be spread over or through as in air, water, or other matter, especially by fluid motion or passive means.
Food coloring diffuses in water.

Related words

Forms

Past participle: diffused
e.g. diffused → dispersed, distributed, propagated, disseminated…

or Diffuse?

A diffuse writer is fond of amplifying, and abounds in epithets, figures, and illustrations.

Webster's Revised Unabridged Dictionary (1913)

Use in printed books, per decade from 1850 to 2019.

4 letters: long¹, full¹, wide¹, soft¹, thin¹
5 letters: loose¹, windy², wordy², imbue²
6 letters: spread¹, extend², expand², sparse¹, riddle², infuse², prolix
7 letters: publish², lengthy², scatter², copious³, verbose, pervade²
8 letters: disperse², rambling², permeate³
9 letters: broadcast², scattered², redundant³, dispersed², penetrate³, circulate³, propagate³, garrulous³, diffusive, ambagious, forspread
10 letters: distribute³, voluminous⁴, discursive³, pleonastic, palaverous
11 letters: distributed⁴, disseminate⁴, circularize⁴, circularise
14 letters: interpenetrate

The small number after each word is its number of syllables (windy² = 2 syllables).