Officious, a.
Etymology: [L. officiosus: cf.F. officieux. See Office.]
1. Pertaining to, or being in accordance with, duty. [R.] If there were any lie in the case, it could be no more than as officious and venial one. Note on Gen. xxvii. (Douay version).
2. Disposed to serve; kind; obliging. [Archaic] Yet not to earth are those bright luminaries Officious. Milton. They were tolerably well bred, very officious, humane, and hospitable. Burke.
3. Importunately interposing services; intermeddling in affairs in which one has no concern; meddlesome. You are too officious In her behalf that scorns your services. Shak.
Syn. -- Impertinent; meddling. See Impertinent. -- Of*fi"cious*ly, adv. -- Of*fi"cious*ness, n.
Shades of meaning
Fernald has no entry of its own for officious; he lists it under active, meddlesome.
Where he writes about it:
The officious are undesirably active in the affairs of others. — from active
The meddlesome person interferes unasked in the affairs of others; the intrusive person thrusts himself uninvited into their company or conversation; the obtrusive person thrusts himself or his opinions conceitedly and undesirably upon their notice; the officious person thrusts his services, unasked and undesired, upon others. — from meddlesome
Obtrusive is oftener applied to words, qualities, actions, etc., than to persons; intrusive is used chiefly of persons, as is officious, tho we speak of officious attentions, intrusive remarks; meddlesome is used indifferently of persons, or of words, qualities, actions, etc. — from meddlesome