Everyday Participles
Many -μένος participles have settled into the language as ordinary adjectives you use daily, no verb in sight: κουρασμένος (tired), παντρεμένος (married), χαμένος (lost), ετοιμασμένος (ready/prepared), ντυμένος (dressed). They still decline and agree like any participle - «είμαι κουρασμένη» (a woman: I am tired), «είναι παντρεμένοι» (they are married), «ένα χαμένο κλειδί» (a lost key), «τα παιδιά είναι ντυμένα» (the children are dressed). Two of these - κουρασμένος and παντρεμένος - you already met as vocabulary; now you can see WHY they take that shape (they are the -μένος participles of κουράζω and παντρεύομαι) and how they change to match the person or thing they describe. Knowing the participle rule turns a memorised word into a productive pattern.
The rule
Many -μένος participles have settled into the language as ordinary adjectives, used daily with no verb in sight: κουρασμένος (“tired”), παντρεμένος (“married”), χαμένος (“lost”), ετοιμασμένος (“prepared”), ντυμένος (“dressed”). They still decline and agree like any participle, which is exactly what a memorised vocabulary item cannot do for you: είμαι κουρασμένη said by a woman, είναι παντρεμένοι of a couple, ένα χαμένο γράμμα, τα παιδιά είναι ντυμένα. Knowing the rule behind them turns each from a word you happened to learn into a pattern you can extend: meet a new verb, place its class, and its adjective comes free.