HALF-HEARTED, HALF-HEARTEDLY
ADJECTIVES
1905 — HAMMER-TACKING dawdling; working in a half-hearted manner → Eng. dial. (Bk.)
1933 — HALF-ARSED — HALF-ASSED incomplete, not serious, half-hearted → US sl.
ADVERBS
1440 — FAINTLY with hesitation, not actively or energetically, coldly, half-heartedly → obs.
1785 — HAFFLINS-WISE partly, in a slight measure; reluctantly, half-heartedly → Sc.
NOUNS
1905 — HALF-LAUGH any action done by halves, or half-heartedly → Eng. dial. (Bk.)
VERBS
1905 — DOG IT to act lazily or half-heartedly; to slack, to idle → US sl.
1945 — HAVE ONE FOOT IN THE STIRRUP to do something half-heartedly → US Western usage (Bk.)
Lexicophilia 