The phrase "although acceptable" is correct and usable in written English.
It can be used to introduce a contrasting idea or condition, often to indicate that something is permissible despite potential drawbacks or issues.
Example: "The proposal is not ideal, but it is, although acceptable, a step in the right direction."
Alternatives: "though permissible" or "albeit satisfactory".
Although acceptable for most patients, the range of motion obtained by traditional knee replacements may not be enough for certain patient populations.
The use of higher microwave frequencies, although acceptable for short paths, is limited by the dramatic increase in rainfall and atmospheric attenuation.
Metal oxide compounds are a promising category of materials for the Li-ion battery anode due to their high theoretical capacity and natural abundance, although acceptable capacity retention and cycle life has not yet been achieved.
A huge platter of Florentine-style steak with "Tuscan fries" and grilled tomatoes is a bit of a bore, and osso buco with fava beans and red-pepper risotto, although acceptable, never quite achieves the nirvana of falling off the bone at the merest nudge of a fork.
However, the protocol is relatively inflexible, and the clinical burden, although acceptable, was higher than desired.
In fact, as expected with the increase of the curvature, the deviation also gets higher, although acceptable.
Perhaps his writing - although perfectly acceptable - wasn't good enough or original enough?
Moreover, literature publishable at one time often lost favour later; although nominally acceptable, it was frequently unobtainable.
Although the acceptable standard error of focal depth for event solutions was set as less than 10 km, the scatter of computed hypocenters from the mainshock fault plane projection is more than 10 km.
Although more acceptable than "I don't know, dude," bosses frown on naked admissions of ignorance.
The Marsh Tacky generally stands between high, although the acceptable range is between high.
