Aorist Mediopassive: -θηκα

A large core of mediopassive verbs — the -ομαι group — forms its aorist with -θηκα or a consonant variant. The reading may be truly passive (αγαπιέμαι "be loved"), reflexive/middle (ντύνομαι "get dressed"), or deponent with active meaning (φοβάμαι "be afraid"). The suffix supplies the perfective viewpoint: it packages one occurrence or a finite, delimited series as a bounded whole. It does not by itself assert objective completion or forbid repetition. Some very common -ομαι verbs use suppletive aorists instead, as the final section shows.

Greek splits the mediopassive past by viewpoint, exactly as it does the active. The -θηκα aorist views a situation from outside as a bounded whole; the -όμουν imperfect presents its internal development or an open habit. Κουράστηκα is commonly I got tired; κουραζόμουν is I was getting tired / I used to get tired. Those English equivalents are useful in this context, not mechanical translations.

The endings

Take αγαπιέμαι ("to be loved"), whose aorist is αγαπήθηκα:

Notice how close this is to the active endings. The active aorist runs -α, -ες, -ε, -αμε, -ατε, -αν; the mediopassive simply glues those same person-endings onto a -θηκ- block: -θηκα, -θηκες, -θηκε, -θήκαμε, -θήκατε, -θηκαν. Learn the block and the persons fall out for free.

Where the accent sits — and why it jumps

There is one movement you must not miss. The stress in this tense is antepenultimate — it sits on the third syllable from the end all the way through the paradigm. In the singular and the 3rd plural, that third-from-last syllable is the one right before -θηκα: αγαπήθηκα, ντύθηκα, κουράστηκα. But the 1st and 2nd plural endings, -θήκαμε / -θήκατε, are one syllable longer, which drags the antepenult forward onto the -θή- itself: αγαπηθήκαμε, κουραστήκαμε. So the written accent appears to jump one step to the right in "we" and "you (pl.)". This is not a quirk of individual verbs — it is the universal Greek rule that stress may never fall further back than the third syllable, so the longer ending pushes it along.

What -θηκα actually means: three readings

The -ομαι voice covers three jobs, and the -θηκα aorist can supply the perfective past in all three. The form does not change; context identifies the reading.

1. True passive — the subject was acted on. It was written, it was built, it was found.

2. Reflexive / middle — the subject did it to or for itself. I got dressed, I washed, I got up.

3. Deponent — an active meaning locked inside the -ομαι shape. Everyday verbs such as φοβάμαι (be afraid), θυμάμαι (remember), κοιμάμαι (sleep), and λυπάμαι (be sorry) have no active counterpart with the same lexical meaning, even where a related active verb exists. Their aorist still lands on -θηκα.

The pair to burn in: -θηκα aorist vs -όμουν imperfect

English often leaves this viewpoint choice to context or expresses it with auxiliaries, while Greek builds it into the verb stem and ending. The same verb, κουράζομαι, gives you both:

In these contexts, the first presents becoming tired as a bounded change; the second presents easy tiring as an open past tendency. The third packages three mornings as a finite perfective series. Event count alone therefore does not choose the form. The mediopassive imperfect page drills the -όμουν side.

The consonant variants — a preview

You will already have spotted that κουράστηκα ends in -στηκα, not plain -θηκα, and that γράφομαι gives γράφτηκα. Recurring consonant patterns produce -φτηκα (γράφτηκα, κρύφτηκα), -χτηκα (ρίχτηκα, τυλίχτηκα), and -στηκα (κουράστηκα, αναγκάστηκα). They are useful families, but stem alternations mean that learners should still learn the aorist principal part rather than derive every verb from its final consonant. Plain -θηκα appears in forms such as ντύθηκα, σηκώθηκα, χάθηκα. Master the endings and accent here first; then read the -στηκα / -χτηκα variants.

A few verbs opt out — they are suppletive

Two of the most common mediopassive verbs refuse the -θηκα pattern and switch root instead: έρχομαι ("come") → ήρθα, and γίνομαι ("become, happen") → έγινα. And κάθομαι ("sit") takes an active-looking aorist, κάθισα, not a -θηκα form. These are high-frequency and simply have to be learned as they are; they sit with the irregular and suppletive aorists.

Common Mistakes

1. Treating a past-time phrase as if it chose the aspect automatically. Both forms are grammatical. The aorist presents the change as bounded; the imperfect opens the development from inside:

2. Regularizing a suppletive verb. έρχομαι has no ×ερχόθηκα; its aorist is ήρθα.

3. Not moving the accent in the 1st/2nd plural. The longer ending forces the stress forward onto -θή-.

4. Borrowing an active -σα ending for a deponent. κοιμάμαι is mediopassive; there is no ×κοιμήσα.

Key Takeaways

• -θηκα is a common perfective past pattern across the -ομαι voice: passive, reflexive/middle, and deponent. It presents one occurrence or a finite series as a bounded whole.
• Endings: -θηκα, -θηκες, -θηκε, -θήκαμε, -θήκατε, -θηκαν. The stress is antepenultimate — on the syllable before -θηκα in the singular and 3rd plural (ντύθηκα), and forward onto -θή- in the 1st/2nd plural (ντυθήκαμε).
• Hold the viewpoint pair apart: -θηκα aorist = bounded whole; -όμουν imperfect = internal process or open habit. English equivalents depend on context.
• Recurring stem patterns give -φτηκα / -χτηκα / -στηκα, but learners should still memorize the aorist principal part — see the variants page.
• A handful of top-frequency verbs are suppletive: έρχομαι → ήρθα, γίνομαι → έγινα, κάθομαι → κάθισα.