Here are some subtle delineations between similar audio engineering terms, all meaning “without something.”

Flat: no EQ

Dry: no reverb; sometimes refers to absence of other effects, but it’s usually about reverb

No Effects: no true effects such as delay, chorus, or reverb, but it might include EQ, which is considered sound processing (except in extreme applications, such as using EQ to imitate a shrill, lo-fi phone call voice)

Raw: no effects or sound processing of any kind

(Thanks to Michael Hamilton and Rob Jaczko for their input on this.)