Solidish | Definition of Solidish by Merriam-Webster.

Is ish an actual word?

The canonical use of -ish is as a suffix meaning “approximately,” as in bluish, tallish, sixish, or even hungry-ish. As a word by itself—which is to say, not as a suffix—ish means more or less the same thing: kind of, thereabouts, in a way. ...

How do you write ish in time?

-ish is added to words referring to times, dates, or ages to form words which indicate that the time or age mentioned is approximate. I'll call you guys tomorrow. Noon-ish. The nurse was fiftyish.