I'm thinking of a word that rhymes with 7 + 1

Due to a completely rational fear of The Soul Eater, Bel-Shamharoth (His number lyeth between seven and nine; it is twice four), I cannot say what my word rhymes with. You do the math.

I feel very dignified and sombre this morning

No need to be sombre, wear a sombrero, that should lighten the mood. You could also get in a lift, to elevate you.

Not elevate Not

that wasn't my word Jim....errrm, the way a bride (sometimes!) will move down the altar, or a papal procession etc

OK, I didn't get the feel of a bridal or papal procession, but...
♪♫
(Magenta) You're spaced out on sensation.
(Riff Raff) Like you're under sedation.
(Guests) Let's do the Time Warp again.
♪♫

Not elevate, sedate Not

to form square indentations in a wall etc, like the battlements of a castle

That's not square, that's pretty groovy. Not Crenelate though, not even with a double 'l'.

Not elevate, sedate, crenelate Not

like my boss, sits behind me with his sue do this, sue do that, sue do everything, while he reads the paper?

There is a fine line (well, not so fine, really) between someone who can delegate and a lazy bastard!

Not elevate, sedate, crenelate, delegate Not

Changing "bonjour" to "hello, or "obrigado" to "thank you?"

Welcome to Crambo!

You're in at the deep end. My word was indeed 'translate'.

Your turn.

I am "chocado", "choqué", "schockiert", "conmocionado", and even "震惊"! Give me a bit of time to calm down, and I'll be back with the next Crambo shortly.