- weakened: My father had a somewhat attenuated relationship with his own family, as his childhood was quite traumatic.
- thin; slender or fine: Images of the conjoined twins’ brains reveal an attenuated line stretching between the two organs, called a thalamic bridge.
- (of a strain of disease-causing virus or bacterium) rendered less virulent: The attenuated poliovirus in the Sabin vaccine replicates very efficiently in the gut, but less so in the nervous system.
- (of an electronic signal) reduced in amplitude: Accuracy decreases in the case of reflected or attenuated signals—for example, inside buildings.
- the simple past tense and past participle of attenuate.
