accidentally, by chance, circumstantially, unexpectedly, unintentionally

split infinitive, colloquially, synonymously, reflexive pronoun, ungrammatically, dangling modifier, pejoratively, interchangeably, etymologically, mot juste, tritely, collective noun, past participle, transitive verb, forsooth, intransitive verb, truthy, subjunctive mood, allegorically, dictionary definition, abstract noun, flippantly, dangling participle, phrasal verb, auxiliary verb, obtusely, rhyming slang, derogatorily, loosely, francois villon, fitly, apocryphally, proper noun, tu quoque, irrelevantly, prepositional phrase, infra dig, presumptuously, pathetic fallacy, unoriginally, gore vidal, pretentiously, weasel words, cuttingly, hegelian dialectic, ex cathedra, tactlessly, waffly, pedantically, apropos, heretically, peradventure, freudian slip, misunderestimate, felicitously, metaphorically, hyperbolically, ignorantly, declarative sentence, misplaced modifier, vowel sound, pithier, portmanteau word, distastefully, thomas malory, esoterically, equivocally, unclearly, percy bysshe shelley, repugnantly, parochially, backwardly, intelligibly, mutatis mutandis, primitively, benjamin disraeli, equably, folk etymology, generically, sauve qui peut, pig latin, tautologically, tongue twister, glibly, disparagingly, liberally, unkindly, phonetically, grammatically, descriptively, contrariwise, pompously, surplusage, nebulously, egotistically, sagaciously, en passant, trippingly, meaninglessly

by choice, by design, deliberately, designedly, intentionally, on purpose, purposely