Here's what rhymes with gratuitously.

Consider these alternatives

hilariously / variously propagandistic / characteristic impolite / right profane / main oftentimes / times sadistically / statistically demeaning / meaning unnecessarily / necessarily idiotic / logic misconstrued / food patronising / living disloyal / royal preachy / treaty gory / story impersonally / personally subverted / converted conceited / treated denigrate / great profanely / mainly trite / right humiliate / late