The phrase "are usually innocuous" is correct and usable in written English.
It can be used to describe something that is generally harmless or not likely to cause any adverse effects.
Example: "Many common household items are usually innocuous, posing little risk to health when used as directed."
Alternatives: "are typically harmless" or "are generally safe".
The festivities are usually innocuous — except when the Islamic State (IS) and Hitler get involved.
Lactobacilli are Gram-positive bacilli that are usually innocuous and exist in daily living environments as probiotics worldwide.
Hence, if there is an increase in the production of factors involved in sensitisation of nerve endings, mechanical stimuli which are usually innocuous to the disc nociceptors could in some cases cause amplified pain sensation.
An adenovirus that is usually innocuous but in its latest strain has led to pneumonia and death.
Such minor trauma is usually innocuous, such as might occur during the course of normal daily activities.
In wild birds indigenous to North America, the infection is usually innocuous, whereas in pheasants, cranes, and emus, the disease is often lethal.
HP are usually considered as innocuous lesions with no malignant potential.
Although the dialogue is usually fairly innocuous family talk, there is no clear warning in the bibliographic notes of what the author is doing.
Fear of "cultists" – an innocuous-sounding descriptor for powerful, violent groups, such as those responsible for the torso in the Thames case – is also a basis for asylum claims, but again, such cults are usually, although not always local.
While a transaction's raw data string is usually filled with innocuous info about the purchase or the vendor— for a handful of accounts (or more specifically 5) the credit card number was included.
Most teens these days are pretty square, and even when they do get themselves into trouble, it's usually over something pretty innocuous, like pranking their neighbours or drinking at a football game.
