IPA: //səbˈdʒɛktləs//
KK: /sʌbˈdʒɛktləs/
Not having a subject in a sentence or clause.
In the phrase 'It is raining', the sentence is subjectless because 'it' does not refer to a specific subject.
Subjectless → It is formed from "subject" (from Latin "subiectus", meaning placed under) and "-less" (meaning without). The word "subjectless" means without a subject or lacking a subject.
Think of being 'without' ('-less') something that is 'placed under' ('subiectus') — that's why subjectless means lacking a subject.